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org.apache.hadoop.hive.ql.parse.SemanticAnalyzer Maven / Gradle / Ivy

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hadoop.hive.ql.parse;

import static org.apache.hadoop.hive.conf.HiveConf.ConfVars.HIVESTATSDBCLASS;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.Serializable;
import java.security.AccessControlException;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Deque;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Queue;
import java.util.Set;
import java.util.TreeSet;
import java.util.UUID;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

import org.antlr.runtime.ClassicToken;
import org.antlr.runtime.CommonToken;
import org.antlr.runtime.Token;
import org.antlr.runtime.TokenRewriteStream;
import org.antlr.runtime.tree.Tree;
import org.antlr.runtime.tree.TreeVisitor;
import org.antlr.runtime.tree.TreeVisitorAction;
import org.antlr.runtime.tree.TreeWizard;
import org.antlr.runtime.tree.TreeWizard.ContextVisitor;
import org.apache.calcite.rel.RelNode;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.mutable.MutableBoolean;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsAction;
import org.apache.hadoop.hive.common.FileUtils;
import org.apache.hadoop.hive.common.ObjectPair;
import org.apache.hadoop.hive.common.StatsSetupConst;
import org.apache.hadoop.hive.common.StatsSetupConst.StatDB;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.conf.HiveConf.ConfVars;
import org.apache.hadoop.hive.conf.HiveConf.StrictChecks;
import org.apache.hadoop.hive.metastore.MetaStoreUtils;
import org.apache.hadoop.hive.metastore.TableType;
import org.apache.hadoop.hive.metastore.Warehouse;
import org.apache.hadoop.hive.metastore.api.Database;
import org.apache.hadoop.hive.metastore.api.FieldSchema;
import org.apache.hadoop.hive.metastore.api.MetaException;
import org.apache.hadoop.hive.metastore.api.Order;
import org.apache.hadoop.hive.metastore.api.SQLForeignKey;
import org.apache.hadoop.hive.metastore.api.SQLPrimaryKey;
import org.apache.hadoop.hive.ql.CompilationOpContext;
import org.apache.hadoop.hive.ql.Context;
import org.apache.hadoop.hive.ql.ErrorMsg;
import org.apache.hadoop.hive.ql.QueryProperties;
import org.apache.hadoop.hive.ql.QueryState;
import org.apache.hadoop.hive.ql.exec.AbstractMapJoinOperator;
import org.apache.hadoop.hive.ql.exec.ArchiveUtils;
import org.apache.hadoop.hive.ql.exec.ColumnInfo;
import org.apache.hadoop.hive.ql.exec.ExprNodeEvaluatorFactory;
import org.apache.hadoop.hive.ql.exec.FetchTask;
import org.apache.hadoop.hive.ql.exec.FileSinkOperator;
import org.apache.hadoop.hive.ql.exec.FilterOperator;
import org.apache.hadoop.hive.ql.exec.FunctionInfo;
import org.apache.hadoop.hive.ql.exec.FunctionRegistry;
import org.apache.hadoop.hive.ql.exec.GroupByOperator;
import org.apache.hadoop.hive.ql.exec.JoinOperator;
import org.apache.hadoop.hive.ql.exec.Operator;
import org.apache.hadoop.hive.ql.exec.OperatorFactory;
import org.apache.hadoop.hive.ql.exec.RecordReader;
import org.apache.hadoop.hive.ql.exec.RecordWriter;
import org.apache.hadoop.hive.ql.exec.ReduceSinkOperator;
import org.apache.hadoop.hive.ql.exec.RowSchema;
import org.apache.hadoop.hive.ql.exec.SMBMapJoinOperator;
import org.apache.hadoop.hive.ql.exec.SelectOperator;
import org.apache.hadoop.hive.ql.exec.TableScanOperator;
import org.apache.hadoop.hive.ql.exec.Task;
import org.apache.hadoop.hive.ql.exec.TaskFactory;
import org.apache.hadoop.hive.ql.exec.UnionOperator;
import org.apache.hadoop.hive.ql.exec.Utilities;
import org.apache.hadoop.hive.ql.hooks.ReadEntity;
import org.apache.hadoop.hive.ql.hooks.WriteEntity;
import org.apache.hadoop.hive.ql.io.AcidOutputFormat;
import org.apache.hadoop.hive.ql.io.AcidUtils;
import org.apache.hadoop.hive.ql.io.AcidUtils.Operation;
import org.apache.hadoop.hive.ql.io.CombineHiveInputFormat;
import org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat;
import org.apache.hadoop.hive.ql.io.HiveOutputFormat;
import org.apache.hadoop.hive.ql.io.NullRowsInputFormat;
import org.apache.hadoop.hive.ql.io.RCFileInputFormat;
import org.apache.hadoop.hive.ql.io.orc.OrcInputFormat;
import org.apache.hadoop.hive.ql.lib.DefaultGraphWalker;
import org.apache.hadoop.hive.ql.lib.Dispatcher;
import org.apache.hadoop.hive.ql.lib.GraphWalker;
import org.apache.hadoop.hive.ql.lib.Node;
import org.apache.hadoop.hive.ql.metadata.DummyPartition;
import org.apache.hadoop.hive.ql.metadata.Hive;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.metadata.HiveUtils;
import org.apache.hadoop.hive.ql.metadata.InvalidTableException;
import org.apache.hadoop.hive.ql.metadata.Partition;
import org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient;
import org.apache.hadoop.hive.ql.metadata.Table;
import org.apache.hadoop.hive.ql.metadata.VirtualColumn;
import org.apache.hadoop.hive.ql.optimizer.Optimizer;
import org.apache.hadoop.hive.ql.optimizer.Transform;
import org.apache.hadoop.hive.ql.optimizer.calcite.CalciteSemanticException;
import org.apache.hadoop.hive.ql.optimizer.calcite.CalciteSemanticException.UnsupportedFeature;
import org.apache.hadoop.hive.ql.optimizer.calcite.translator.HiveOpConverterPostProc;
import org.apache.hadoop.hive.ql.optimizer.lineage.Generator;
import org.apache.hadoop.hive.ql.optimizer.unionproc.UnionProcContext;
import org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.TableSpec.SpecType;
import org.apache.hadoop.hive.ql.parse.CalcitePlanner.ASTSearcher;
import org.apache.hadoop.hive.ql.parse.ExplainConfiguration.AnalyzeState;
import org.apache.hadoop.hive.ql.parse.PTFInvocationSpec.OrderExpression;
import org.apache.hadoop.hive.ql.parse.PTFInvocationSpec.OrderSpec;
import org.apache.hadoop.hive.ql.parse.PTFInvocationSpec.PTFInputSpec;
import org.apache.hadoop.hive.ql.parse.PTFInvocationSpec.PTFQueryInputSpec;
import org.apache.hadoop.hive.ql.parse.PTFInvocationSpec.PTFQueryInputType;
import org.apache.hadoop.hive.ql.parse.PTFInvocationSpec.PartitionExpression;
import org.apache.hadoop.hive.ql.parse.PTFInvocationSpec.PartitionSpec;
import org.apache.hadoop.hive.ql.parse.PTFInvocationSpec.PartitionedTableFunctionSpec;
import org.apache.hadoop.hive.ql.parse.PTFInvocationSpec.PartitioningSpec;
import org.apache.hadoop.hive.ql.parse.QBSubQuery.SubQueryType;
import org.apache.hadoop.hive.ql.parse.SubQueryUtils.ISubQueryJoinInfo;
import org.apache.hadoop.hive.ql.parse.WindowingSpec.BoundarySpec;
import org.apache.hadoop.hive.ql.parse.WindowingSpec.Direction;
import org.apache.hadoop.hive.ql.parse.WindowingSpec.WindowExpressionSpec;
import org.apache.hadoop.hive.ql.parse.WindowingSpec.WindowFrameSpec;
import org.apache.hadoop.hive.ql.parse.WindowingSpec.WindowFunctionSpec;
import org.apache.hadoop.hive.ql.parse.WindowingSpec.WindowSpec;
import org.apache.hadoop.hive.ql.parse.WindowingSpec.WindowType;
import org.apache.hadoop.hive.ql.plan.AggregationDesc;
import org.apache.hadoop.hive.ql.plan.AlterTableDesc;
import org.apache.hadoop.hive.ql.plan.AlterTableDesc.AlterTableTypes;
import org.apache.hadoop.hive.ql.plan.CreateTableDesc;
import org.apache.hadoop.hive.ql.plan.CreateTableLikeDesc;
import org.apache.hadoop.hive.ql.plan.CreateViewDesc;
import org.apache.hadoop.hive.ql.plan.DDLWork;
import org.apache.hadoop.hive.ql.plan.DynamicPartitionCtx;
import org.apache.hadoop.hive.ql.plan.ExprNodeColumnDesc;
import org.apache.hadoop.hive.ql.plan.ExprNodeColumnListDesc;
import org.apache.hadoop.hive.ql.plan.ExprNodeConstantDesc;
import org.apache.hadoop.hive.ql.plan.ExprNodeDesc;
import org.apache.hadoop.hive.ql.plan.ExprNodeDescUtils;
import org.apache.hadoop.hive.ql.plan.ExprNodeFieldDesc;
import org.apache.hadoop.hive.ql.plan.ExprNodeGenericFuncDesc;
import org.apache.hadoop.hive.ql.plan.FileSinkDesc;
import org.apache.hadoop.hive.ql.plan.FilterDesc;
import org.apache.hadoop.hive.ql.plan.FilterDesc.SampleDesc;
import org.apache.hadoop.hive.ql.plan.ForwardDesc;
import org.apache.hadoop.hive.ql.plan.GroupByDesc;
import org.apache.hadoop.hive.ql.plan.HiveOperation;
import org.apache.hadoop.hive.ql.plan.InsertTableDesc;
import org.apache.hadoop.hive.ql.plan.JoinCondDesc;
import org.apache.hadoop.hive.ql.plan.JoinDesc;
import org.apache.hadoop.hive.ql.plan.LateralViewForwardDesc;
import org.apache.hadoop.hive.ql.plan.LateralViewJoinDesc;
import org.apache.hadoop.hive.ql.plan.LimitDesc;
import org.apache.hadoop.hive.ql.plan.ListBucketingCtx;
import org.apache.hadoop.hive.ql.plan.LoadFileDesc;
import org.apache.hadoop.hive.ql.plan.LoadTableDesc;
import org.apache.hadoop.hive.ql.plan.MapJoinDesc;
import org.apache.hadoop.hive.ql.plan.OperatorDesc;
import org.apache.hadoop.hive.ql.plan.PTFDesc;
import org.apache.hadoop.hive.ql.plan.PlanUtils;
import org.apache.hadoop.hive.ql.plan.ReduceSinkDesc;
import org.apache.hadoop.hive.ql.plan.ScriptDesc;
import org.apache.hadoop.hive.ql.plan.SelectDesc;
import org.apache.hadoop.hive.ql.plan.TableDesc;
import org.apache.hadoop.hive.ql.plan.TableScanDesc;
import org.apache.hadoop.hive.ql.plan.UDTFDesc;
import org.apache.hadoop.hive.ql.plan.UnionDesc;
import org.apache.hadoop.hive.ql.plan.ptf.OrderExpressionDef;
import org.apache.hadoop.hive.ql.plan.ptf.PTFExpressionDef;
import org.apache.hadoop.hive.ql.plan.ptf.PartitionedTableFunctionDef;
import org.apache.hadoop.hive.ql.security.authorization.plugin.HivePrivilegeObject;
import org.apache.hadoop.hive.ql.session.SessionState;
import org.apache.hadoop.hive.ql.session.SessionState.ResourceType;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator.Mode;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDFHash;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDFOPOr;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDTF;
import org.apache.hadoop.hive.ql.util.ResourceDownloader;
import org.apache.hadoop.hive.serde.serdeConstants;
import org.apache.hadoop.hive.serde2.Deserializer;
import org.apache.hadoop.hive.serde2.MetadataTypedColumnsetSerDe;
import org.apache.hadoop.hive.serde2.NoOpFetchFormatter;
import org.apache.hadoop.hive.serde2.NullStructSerDe;
import org.apache.hadoop.hive.serde2.SerDeException;
import org.apache.hadoop.hive.serde2.SerDeUtils;
import org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe;
import org.apache.hadoop.hive.serde2.objectinspector.ConstantObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector.Category;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorFactory;
import org.apache.hadoop.hive.serde2.objectinspector.StandardStructObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.StructField;
import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector;
import org.apache.hadoop.hive.serde2.thrift.ThriftJDBCBinarySerDe;
import org.apache.hadoop.hive.serde2.typeinfo.PrimitiveTypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoFactory;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoUtils;
import org.apache.hadoop.hive.shims.HadoopShims;
import org.apache.hadoop.hive.shims.Utils;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.InputFormat;
import org.apache.hadoop.mapred.OutputFormat;
import org.apache.hadoop.security.UserGroupInformation;

import com.google.common.base.Splitter;
import com.google.common.base.Strings;
import com.google.common.collect.Sets;
import com.google.common.math.IntMath;

/**
 * Implementation of the semantic analyzer. It generates the query plan.
 * There are other specific semantic analyzers for some hive operations such as
 * DDLSemanticAnalyzer for ddl operations.
 */

public class SemanticAnalyzer extends BaseSemanticAnalyzer {

  public static final String DUMMY_DATABASE = "_dummy_database";
  public static final String DUMMY_TABLE = "_dummy_table";
  public static final String SUBQUERY_TAG_1 = "-subquery1";
  public static final String SUBQUERY_TAG_2 = "-subquery2";

  // Max characters when auto generating the column name with func name
  private static final int AUTOGEN_COLALIAS_PRFX_MAXLENGTH = 20;

  public static final String VALUES_TMP_TABLE_NAME_PREFIX = "Values__Tmp__Table__";

  static final String MATERIALIZATION_MARKER = "$MATERIALIZATION";

  private HashMap opToPartPruner;
  private HashMap opToPartList;
  protected HashMap topOps;
  protected LinkedHashMap, OpParseContext> opParseCtx;
  private List loadTableWork;
  private List loadFileWork;
  private List columnStatsAutoGatherContexts;
  private final Map joinContext;
  private final Map smbMapJoinContext;
  private final HashMap topToTable;
  private final Map fsopToTable;
  private final List reduceSinkOperatorsAddedByEnforceBucketingSorting;
  private final HashMap> topToTableProps;
  private QB qb;
  private ASTNode ast;
  private int destTableId;
  private UnionProcContext uCtx;
  List> listMapJoinOpsNoReducer;
  private HashMap opToSamplePruner;
  private final Map> opToPartToSkewedPruner;
  private Map viewProjectToTableSchema;
  /**
   * a map for the split sampling, from alias to an instance of SplitSample
   * that describes percentage and number.
   */
  private final HashMap nameToSplitSample;
  Map> groupOpToInputTables;
  Map prunedPartitions;
  protected List resultSchema;
  protected CreateViewDesc createVwDesc;
  protected ArrayList viewsExpanded;
  protected ASTNode viewSelect;
  protected final UnparseTranslator unparseTranslator;
  private final GlobalLimitCtx globalLimitCtx;

  // prefix for column names auto generated by hive
  private final String autogenColAliasPrfxLbl;
  private final boolean autogenColAliasPrfxIncludeFuncName;

  // Keep track of view alias to read entity corresponding to the view
  // For eg: for a query like 'select * from V3', where V3 -> V2, V2 -> V1, V1 -> T
  // keeps track of aliases for V3, V3:V2, V3:V2:V1.
  // This is used when T is added as an input for the query, the parents of T is
  // derived from the alias V3:V2:V1:T
  private final Map viewAliasToInput;

  //need merge isDirect flag to input even if the newInput does not have a parent
  private boolean mergeIsDirect;

  // flag for no scan during analyze ... compute statistics
  protected boolean noscan;

  //flag for partial scan during analyze ... compute statistics
  protected boolean partialscan;

  protected volatile boolean disableJoinMerge = false;
  protected final boolean defaultJoinMerge;

  /*
   * Capture the CTE definitions in a Query.
   */
  final Map aliasToCTEs;

  /*
   * Used to check recursive CTE invocations. Similar to viewsExpanded
   */
  ArrayList ctesExpanded;

  /*
   * Whether root tasks after materialized CTE linkage have been resolved
   */
  boolean rootTasksResolved;

  protected TableMask tableMask;

  CreateTableDesc tableDesc;

  /** Not thread-safe. */
  final ASTSearcher astSearcher = new ASTSearcher();

  protected AnalyzeRewriteContext analyzeRewrite;

  // A mapping from a tableName to a table object in metastore.
  Map tabNameToTabObject;

  // The tokens we should ignore when we are trying to do table masking.
  private final Set ignoredTokens = Sets.newHashSet(HiveParser.TOK_GROUPBY,
      HiveParser.TOK_ORDERBY, HiveParser.TOK_WINDOWSPEC, HiveParser.TOK_CLUSTERBY,
      HiveParser.TOK_DISTRIBUTEBY, HiveParser.TOK_SORTBY);

  static class Phase1Ctx {
    String dest;
    int nextNum;
  }

  public SemanticAnalyzer(QueryState queryState) throws SemanticException {
    super(queryState);
    opToPartPruner = new HashMap();
    opToPartList = new HashMap();
    opToSamplePruner = new HashMap();
    nameToSplitSample = new HashMap();
    // Must be deterministic order maps - see HIVE-8707
    topOps = new LinkedHashMap();
    loadTableWork = new ArrayList();
    loadFileWork = new ArrayList();
    columnStatsAutoGatherContexts = new ArrayList();
    opParseCtx = new LinkedHashMap, OpParseContext>();
    joinContext = new HashMap();
    smbMapJoinContext = new HashMap();
    // Must be deterministic order map for consistent q-test output across Java versions
    topToTable = new LinkedHashMap();
    fsopToTable = new HashMap();
    reduceSinkOperatorsAddedByEnforceBucketingSorting = new ArrayList();
    topToTableProps = new HashMap>();
    destTableId = 1;
    uCtx = null;
    listMapJoinOpsNoReducer = new ArrayList>();
    groupOpToInputTables = new HashMap>();
    prunedPartitions = new HashMap();
    tabNameToTabObject = new HashMap();
    unparseTranslator = new UnparseTranslator(conf);
    autogenColAliasPrfxLbl = HiveConf.getVar(conf,
        HiveConf.ConfVars.HIVE_AUTOGEN_COLUMNALIAS_PREFIX_LABEL);
    autogenColAliasPrfxIncludeFuncName = HiveConf.getBoolVar(conf,
        HiveConf.ConfVars.HIVE_AUTOGEN_COLUMNALIAS_PREFIX_INCLUDEFUNCNAME);
    queryProperties = new QueryProperties();
    opToPartToSkewedPruner = new HashMap>();
    aliasToCTEs = new HashMap();
    globalLimitCtx = new GlobalLimitCtx();
    viewAliasToInput = new HashMap();
    mergeIsDirect = true;
    noscan = partialscan = false;
    tabNameToTabObject = new HashMap<>();
    defaultJoinMerge = false == HiveConf.getBoolVar(conf, HiveConf.ConfVars.HIVE_MERGE_NWAY_JOINS);
    disableJoinMerge = defaultJoinMerge;
  }

  @Override
  protected void reset(boolean clearPartsCache) {
    super.reset(true);
    if(clearPartsCache) {
      prunedPartitions.clear();

      //When init(true) combine with genResolvedParseTree, it will generate Resolved Parse tree from syntax tree
      //ReadEntity created under these conditions should be all relevant to the syntax tree even the ones without parents
      //set mergeIsDirect to true here.
      mergeIsDirect = true;
    } else {
      mergeIsDirect = false;
    }
    tabNameToTabObject.clear();
    loadTableWork.clear();
    loadFileWork.clear();
    columnStatsAutoGatherContexts.clear();
    topOps.clear();
    destTableId = 1;
    idToTableNameMap.clear();
    qb = null;
    ast = null;
    uCtx = null;
    joinContext.clear();
    smbMapJoinContext.clear();
    opParseCtx.clear();
    groupOpToInputTables.clear();
    disableJoinMerge = defaultJoinMerge;
    aliasToCTEs.clear();
    topToTable.clear();
    opToPartPruner.clear();
    opToPartList.clear();
    opToPartToSkewedPruner.clear();
    opToSamplePruner.clear();
    nameToSplitSample.clear();
    fsopToTable.clear();
    resultSchema = null;
    createVwDesc = null;
    viewsExpanded = null;
    viewSelect = null;
    ctesExpanded = null;
    globalLimitCtx.disableOpt();
    viewAliasToInput.clear();
    reduceSinkOperatorsAddedByEnforceBucketingSorting.clear();
    topToTableProps.clear();
    listMapJoinOpsNoReducer.clear();
    unparseTranslator.clear();
    queryProperties.clear();
    outputs.clear();
  }

  public void initParseCtx(ParseContext pctx) {
    opToPartPruner = pctx.getOpToPartPruner();
    opToPartList = pctx.getOpToPartList();
    opToSamplePruner = pctx.getOpToSamplePruner();
    topOps = pctx.getTopOps();
    loadTableWork = pctx.getLoadTableWork();
    loadFileWork = pctx.getLoadFileWork();
    ctx = pctx.getContext();
    destTableId = pctx.getDestTableId();
    idToTableNameMap = pctx.getIdToTableNameMap();
    uCtx = pctx.getUCtx();
    listMapJoinOpsNoReducer = pctx.getListMapJoinOpsNoReducer();
    prunedPartitions = pctx.getPrunedPartitions();
    tabNameToTabObject = pctx.getTabNameToTabObject();
    fetchTask = pctx.getFetchTask();
    setLineageInfo(pctx.getLineageInfo());
  }

  public ParseContext getParseContext() {
    // Make sure the basic query properties are initialized
    copyInfoToQueryProperties(queryProperties);
    return new ParseContext(queryState, opToPartPruner, opToPartList, topOps,
        new HashSet(joinContext.keySet()),
        new HashSet(smbMapJoinContext.keySet()),
        loadTableWork, loadFileWork, columnStatsAutoGatherContexts, ctx, idToTableNameMap, destTableId, uCtx,
        listMapJoinOpsNoReducer, prunedPartitions, tabNameToTabObject,
        opToSamplePruner, globalLimitCtx, nameToSplitSample, inputs, rootTasks,
        opToPartToSkewedPruner, viewAliasToInput, reduceSinkOperatorsAddedByEnforceBucketingSorting,
        analyzeRewrite, tableDesc, createVwDesc, queryProperties, viewProjectToTableSchema, acidFileSinks);
  }

  public CompilationOpContext getOpContext() {
    return ctx.getOpContext();
  }

  public void doPhase1QBExpr(ASTNode ast, QBExpr qbexpr, String id, String alias)
      throws SemanticException {
    doPhase1QBExpr(ast, qbexpr, id, alias, false);
  }
  @SuppressWarnings("nls")
  public void doPhase1QBExpr(ASTNode ast, QBExpr qbexpr, String id, String alias, boolean insideView)
      throws SemanticException {

    assert (ast.getToken() != null);
    if (ast.getToken().getType() == HiveParser.TOK_QUERY) {
      QB qb = new QB(id, alias, true);
      qb.setInsideView(insideView);
      Phase1Ctx ctx_1 = initPhase1Ctx();
      doPhase1(ast, qb, ctx_1, null);

      qbexpr.setOpcode(QBExpr.Opcode.NULLOP);
      qbexpr.setQB(qb);
    }
    // setop
    else {
      switch (ast.getToken().getType()) {
      case HiveParser.TOK_UNIONALL:
        qbexpr.setOpcode(QBExpr.Opcode.UNION);
        break;
      case HiveParser.TOK_INTERSECTALL:
        qbexpr.setOpcode(QBExpr.Opcode.INTERSECTALL);
        break;
      case HiveParser.TOK_INTERSECTDISTINCT:
        qbexpr.setOpcode(QBExpr.Opcode.INTERSECT);
        break;
      case HiveParser.TOK_EXCEPTALL:
        qbexpr.setOpcode(QBExpr.Opcode.EXCEPTALL);
        break;
      case HiveParser.TOK_EXCEPTDISTINCT:
        qbexpr.setOpcode(QBExpr.Opcode.EXCEPT);
        break;
      default:
        throw new SemanticException(ErrorMsg.UNSUPPORTED_SET_OPERATOR.getMsg("Type "
            + ast.getToken().getType()));
      }
      // query 1
      assert (ast.getChild(0) != null);
      QBExpr qbexpr1 = new QBExpr(alias + SUBQUERY_TAG_1);
      doPhase1QBExpr((ASTNode) ast.getChild(0), qbexpr1, id + SUBQUERY_TAG_1, alias
          + SUBQUERY_TAG_1, insideView);
      qbexpr.setQBExpr1(qbexpr1);

      // query 2
      assert (ast.getChild(1) != null);
      QBExpr qbexpr2 = new QBExpr(alias + SUBQUERY_TAG_2);
      doPhase1QBExpr((ASTNode) ast.getChild(1), qbexpr2, id + SUBQUERY_TAG_2, alias
          + SUBQUERY_TAG_2, insideView);
      qbexpr.setQBExpr2(qbexpr2);
    }
  }

  private LinkedHashMap doPhase1GetAggregationsFromSelect(
      ASTNode selExpr, QB qb, String dest) throws SemanticException {

    // Iterate over the selects search for aggregation Trees.
    // Use String as keys to eliminate duplicate trees.
    LinkedHashMap aggregationTrees = new LinkedHashMap();
    List wdwFns = new ArrayList();
    for (int i = 0; i < selExpr.getChildCount(); ++i) {
      ASTNode function = (ASTNode) selExpr.getChild(i);
      if (function.getType() == HiveParser.TOK_SELEXPR ||
          function.getType() == HiveParser.TOK_SUBQUERY_EXPR) {
        function = (ASTNode)function.getChild(0);
      }
      doPhase1GetAllAggregations(function, aggregationTrees, wdwFns);
    }

    // window based aggregations are handled differently
    for (ASTNode wdwFn : wdwFns) {
      WindowingSpec spec = qb.getWindowingSpec(dest);
      if(spec == null) {
        queryProperties.setHasWindowing(true);
        spec = new WindowingSpec();
        qb.addDestToWindowingSpec(dest, spec);
      }
      HashMap wExprsInDest = qb.getParseInfo().getWindowingExprsForClause(dest);
      int wColIdx = spec.getWindowExpressions() == null ? 0 : spec.getWindowExpressions().size();
      WindowFunctionSpec wFnSpec = processWindowFunction(wdwFn,
        (ASTNode)wdwFn.getChild(wdwFn.getChildCount()-1));
      // If this is a duplicate invocation of a function; don't add to WindowingSpec.
      if ( wExprsInDest != null &&
          wExprsInDest.containsKey(wFnSpec.getExpression().toStringTree())) {
        continue;
      }
      wFnSpec.setAlias(wFnSpec.getName() + "_window_" + wColIdx);
      spec.addWindowFunction(wFnSpec);
      qb.getParseInfo().addWindowingExprToClause(dest, wFnSpec.getExpression());
    }

    return aggregationTrees;
  }

  private void doPhase1GetColumnAliasesFromSelect(
      ASTNode selectExpr, QBParseInfo qbp) {
    for (int i = 0; i < selectExpr.getChildCount(); ++i) {
      ASTNode selExpr = (ASTNode) selectExpr.getChild(i);
      if ((selExpr.getToken().getType() == HiveParser.TOK_SELEXPR)
          && (selExpr.getChildCount() == 2)) {
        String columnAlias = unescapeIdentifier(selExpr.getChild(1).getText());
        qbp.setExprToColumnAlias((ASTNode) selExpr.getChild(0), columnAlias);
      }
    }
  }

  /**
   * DFS-scan the expressionTree to find all aggregation subtrees and put them
   * in aggregations.
   *
   * @param expressionTree
   * @param aggregations
   *          the key to the HashTable is the toStringTree() representation of
   *          the aggregation subtree.
   * @throws SemanticException
   */
  private void doPhase1GetAllAggregations(ASTNode expressionTree,
      HashMap aggregations, List wdwFns) throws SemanticException {
    int exprTokenType = expressionTree.getToken().getType();
    if(exprTokenType == HiveParser.TOK_SUBQUERY_EXPR) {
      //since now we have scalar subqueries we can get subquery expression in having
      // we don't want to include aggregate from within subquery
      return;
    }

    if (exprTokenType == HiveParser.TOK_FUNCTION
        || exprTokenType == HiveParser.TOK_FUNCTIONDI
        || exprTokenType == HiveParser.TOK_FUNCTIONSTAR) {
      assert (expressionTree.getChildCount() != 0);
      if (expressionTree.getChild(expressionTree.getChildCount()-1).getType()
          == HiveParser.TOK_WINDOWSPEC) {
        // If it is a windowing spec, we include it in the list
        // Further, we will examine its children AST nodes to check whether
        // there are aggregation functions within
        wdwFns.add(expressionTree);
        doPhase1GetAllAggregations((ASTNode) expressionTree.getChild(expressionTree.getChildCount()-1),
                aggregations, wdwFns);
        return;
      }
      if (expressionTree.getChild(0).getType() == HiveParser.Identifier) {
        String functionName = unescapeIdentifier(expressionTree.getChild(0)
            .getText());
        // Validate the function name
        if (FunctionRegistry.getFunctionInfo(functionName) == null) {
          throw new SemanticException(ErrorMsg.INVALID_FUNCTION.getMsg(functionName));
        }
        if(FunctionRegistry.impliesOrder(functionName)) {
          throw new SemanticException(ErrorMsg.MISSING_OVER_CLAUSE.getMsg(functionName));
        }
        if (FunctionRegistry.getGenericUDAFResolver(functionName) != null) {
          if(containsLeadLagUDF(expressionTree)) {
            throw new SemanticException(ErrorMsg.MISSING_OVER_CLAUSE.getMsg(functionName));
          }
          aggregations.put(expressionTree.toStringTree(), expressionTree);
          FunctionInfo fi = FunctionRegistry.getFunctionInfo(functionName);
          if (!fi.isNative()) {
            unparseTranslator.addIdentifierTranslation((ASTNode) expressionTree
                .getChild(0));
          }
          return;
        }
      }
    }
    for (int i = 0; i < expressionTree.getChildCount(); i++) {
      doPhase1GetAllAggregations((ASTNode) expressionTree.getChild(i),
          aggregations, wdwFns);
    }
  }

  private List doPhase1GetDistinctFuncExprs(
      HashMap aggregationTrees) throws SemanticException {
    List exprs = new ArrayList();
    for (Map.Entry entry : aggregationTrees.entrySet()) {
      ASTNode value = entry.getValue();
      assert (value != null);
      if (value.getToken().getType() == HiveParser.TOK_FUNCTIONDI) {
        exprs.add(value);
      }
    }
    return exprs;
  }

  public static String generateErrorMessage(ASTNode ast, String message) {
    StringBuilder sb = new StringBuilder();
    if (ast == null) {
      sb.append(message).append(". Cannot tell the position of null AST.");
      return sb.toString();
    }
    sb.append(ast.getLine());
    sb.append(":");
    sb.append(ast.getCharPositionInLine());
    sb.append(" ");
    sb.append(message);
    sb.append(". Error encountered near token '");
    sb.append(ErrorMsg.getText(ast));
    sb.append("'");
    return sb.toString();
  }

  ASTNode getAST() {
    return this.ast;
  }

  protected void setAST(ASTNode newAST) {
    this.ast = newAST;
  }

  int[] findTabRefIdxs(ASTNode tabref) {
    assert tabref.getType() == HiveParser.TOK_TABREF;
    int aliasIndex = 0;
    int propsIndex = -1;
    int tsampleIndex = -1;
    int ssampleIndex = -1;
    for (int index = 1; index < tabref.getChildCount(); index++) {
      ASTNode ct = (ASTNode) tabref.getChild(index);
      if (ct.getToken().getType() == HiveParser.TOK_TABLEBUCKETSAMPLE) {
        tsampleIndex = index;
      } else if (ct.getToken().getType() == HiveParser.TOK_TABLESPLITSAMPLE) {
        ssampleIndex = index;
      } else if (ct.getToken().getType() == HiveParser.TOK_TABLEPROPERTIES) {
        propsIndex = index;
      } else {
        aliasIndex = index;
      }
    }
    return new int[] {aliasIndex, propsIndex, tsampleIndex, ssampleIndex};
  }
  String findSimpleTableName(ASTNode tabref, int aliasIndex) {
    assert tabref.getType() == HiveParser.TOK_TABREF;
    ASTNode tableTree = (ASTNode) (tabref.getChild(0));

    String alias;
    if (aliasIndex != 0) {
      alias = unescapeIdentifier(tabref.getChild(aliasIndex).getText());
    }
    else {
      alias = getUnescapedUnqualifiedTableName(tableTree);
    }
    return alias;
  }
  /**
   * Goes though the tabref tree and finds the alias for the table. Once found,
   * it records the table name-> alias association in aliasToTabs. It also makes
   * an association from the alias to the table AST in parse info.
   *
   * @return the alias of the table
   */
  private String processTable(QB qb, ASTNode tabref) throws SemanticException {
    // For each table reference get the table name
    // and the alias (if alias is not present, the table name
    // is used as an alias)
    int[] indexes = findTabRefIdxs(tabref);
    int aliasIndex = indexes[0];
    int propsIndex = indexes[1];
    int tsampleIndex = indexes[2];
    int ssampleIndex = indexes[3];

    ASTNode tableTree = (ASTNode) (tabref.getChild(0));

    String tabIdName = getUnescapedName(tableTree).toLowerCase();

    String alias = findSimpleTableName(tabref, aliasIndex);

    if (propsIndex >= 0) {
      Tree propsAST = tabref.getChild(propsIndex);
      Map props = DDLSemanticAnalyzer.getProps((ASTNode) propsAST.getChild(0));
      // We get the information from Calcite.
      if ("TRUE".equals(props.get("insideView"))) {
        qb.getAliasInsideView().add(alias.toLowerCase());
      }
      qb.setTabProps(alias, props);
    }

    // If the alias is already there then we have a conflict
    if (qb.exists(alias)) {
      throw new SemanticException(ErrorMsg.AMBIGUOUS_TABLE_ALIAS.getMsg(tabref
          .getChild(aliasIndex)));
    }
    if (tsampleIndex >= 0) {
      ASTNode sampleClause = (ASTNode) tabref.getChild(tsampleIndex);
      ArrayList sampleCols = new ArrayList();
      if (sampleClause.getChildCount() > 2) {
        for (int i = 2; i < sampleClause.getChildCount(); i++) {
          sampleCols.add((ASTNode) sampleClause.getChild(i));
        }
      }
      // TODO: For now only support sampling on up to two columns
      // Need to change it to list of columns
      if (sampleCols.size() > 2) {
        throw new SemanticException(generateErrorMessage(
            (ASTNode) tabref.getChild(0),
            ErrorMsg.SAMPLE_RESTRICTION.getMsg()));
      }
      TableSample tabSample = new TableSample(
              unescapeIdentifier(sampleClause.getChild(0).getText()),
              unescapeIdentifier(sampleClause.getChild(1).getText()),
              sampleCols);
      qb.getParseInfo().setTabSample(alias, tabSample);
      if (unparseTranslator.isEnabled()) {
        for (ASTNode sampleCol : sampleCols) {
          unparseTranslator.addIdentifierTranslation((ASTNode) sampleCol
              .getChild(0));
        }
      }
    } else if (ssampleIndex >= 0) {
      ASTNode sampleClause = (ASTNode) tabref.getChild(ssampleIndex);

      Tree type = sampleClause.getChild(0);
      Tree numerator = sampleClause.getChild(1);
      String value = unescapeIdentifier(numerator.getText());


      SplitSample sample;
      if (type.getType() == HiveParser.TOK_PERCENT) {
        assertCombineInputFormat(numerator, "Percentage");
        Double percent = Double.valueOf(value).doubleValue();
        if (percent < 0  || percent > 100) {
          throw new SemanticException(generateErrorMessage((ASTNode) numerator,
              "Sampling percentage should be between 0 and 100"));
        }
        int seedNum = conf.getIntVar(ConfVars.HIVESAMPLERANDOMNUM);
        sample = new SplitSample(percent, seedNum);
      } else if (type.getType() == HiveParser.TOK_ROWCOUNT) {
        sample = new SplitSample(Integer.parseInt(value));
      } else {
        assert type.getType() == HiveParser.TOK_LENGTH;
        assertCombineInputFormat(numerator, "Total Length");
        long length = Integer.parseInt(value.substring(0, value.length() - 1));
        char last = value.charAt(value.length() - 1);
        if (last == 'k' || last == 'K') {
          length <<= 10;
        } else if (last == 'm' || last == 'M') {
          length <<= 20;
        } else if (last == 'g' || last == 'G') {
          length <<= 30;
        }
        int seedNum = conf.getIntVar(ConfVars.HIVESAMPLERANDOMNUM);
        sample = new SplitSample(length, seedNum);
      }
      String alias_id = getAliasId(alias, qb);
      nameToSplitSample.put(alias_id, sample);
    }
    // Insert this map into the stats
    qb.setTabAlias(alias, tabIdName);
    if (qb.isInsideView()) {
      qb.getAliasInsideView().add(alias.toLowerCase());
    }
    qb.addAlias(alias);

    qb.getParseInfo().setSrcForAlias(alias, tableTree);

    // if alias to CTE contains the table name, we do not do the translation because
    // cte is actually a subquery.
    if (!this.aliasToCTEs.containsKey(tabIdName)) {
      unparseTranslator.addTableNameTranslation(tableTree, SessionState.get().getCurrentDatabase());
      if (aliasIndex != 0) {
        unparseTranslator.addIdentifierTranslation((ASTNode) tabref.getChild(aliasIndex));
      }
    }

    return alias;
  }

  Map getNameToSplitSampleMap() {
    return this.nameToSplitSample;
  }

  /**
   * Convert a string to Text format and write its bytes in the same way TextOutputFormat would do.
   * This is needed to properly encode non-ascii characters.
   */
  private static void writeAsText(String text, FSDataOutputStream out) throws IOException {
    Text to = new Text(text);
    out.write(to.getBytes(), 0, to.getLength());
  }

  /**
   * Generate a temp table out of a values clause
   * See also {@link #preProcessForInsert(ASTNode, QB)}
   */
  private ASTNode genValuesTempTable(ASTNode originalFrom, QB qb) throws SemanticException {
    Path dataDir = null;
    if(!qb.getEncryptedTargetTablePaths().isEmpty()) {
      //currently only Insert into T values(...) is supported thus only 1 values clause
      //and only 1 target table are possible.  If/when support for
      //select ... from values(...) is added an insert statement may have multiple
      //encrypted target tables.
      dataDir = ctx.getMRTmpPath(qb.getEncryptedTargetTablePaths().get(0).toUri());
    }
    // Pick a name for the table
    SessionState ss = SessionState.get();
    String tableName = VALUES_TMP_TABLE_NAME_PREFIX + ss.getNextValuesTempTableSuffix();

    // Step 1, parse the values clause we were handed
    List fromChildren = originalFrom.getChildren();
    // First child should be the virtual table ref
    ASTNode virtualTableRef = (ASTNode)fromChildren.get(0);
    assert virtualTableRef.getToken().getType() == HiveParser.TOK_VIRTUAL_TABREF :
        "Expected first child of TOK_VIRTUAL_TABLE to be TOK_VIRTUAL_TABREF but was " +
            virtualTableRef.getName();

    List virtualTableRefChildren = virtualTableRef.getChildren();
    // First child of this should be the table name.  If it's anonymous,
    // then we don't have a table name.
    ASTNode tabName = (ASTNode)virtualTableRefChildren.get(0);
    if (tabName.getToken().getType() != HiveParser.TOK_ANONYMOUS) {
      // TODO, if you want to make select ... from (values(...) as foo(...) work,
      // you need to parse this list of columns names and build it into the table
      throw new SemanticException(ErrorMsg.VALUES_TABLE_CONSTRUCTOR_NOT_SUPPORTED.getMsg());
    }

    // The second child of the TOK_VIRTUAL_TABLE should be TOK_VALUES_TABLE
    ASTNode valuesTable = (ASTNode)fromChildren.get(1);
    assert valuesTable.getToken().getType() == HiveParser.TOK_VALUES_TABLE :
        "Expected second child of TOK_VIRTUAL_TABLE to be TOK_VALUE_TABLE but was " +
            valuesTable.getName();
    // Each of the children of TOK_VALUES_TABLE will be a TOK_VALUE_ROW
    List valuesTableChildren = valuesTable.getChildren();

    // Now that we're going to start reading through the rows, open a file to write the rows too
    // If we leave this method before creating the temporary table we need to be sure to clean up
    // this file.
    Path tablePath = null;
    FileSystem fs = null;
    FSDataOutputStream out = null;
    try {
      if(dataDir == null) {
        tablePath = Warehouse.getDnsPath(new Path(ss.getTempTableSpace(), tableName), conf);
      }
      else {
        //if target table of insert is encrypted, make sure temporary table data is stored
        //similarly encrypted
        tablePath = Warehouse.getDnsPath(new Path(dataDir, tableName), conf);
      }
      fs = tablePath.getFileSystem(conf);
      fs.mkdirs(tablePath);
      Path dataFile = new Path(tablePath, "data_file");
      out = fs.create(dataFile);
      List fields = new ArrayList();

      boolean firstRow = true;
      for (Node n : valuesTableChildren) {
        ASTNode valuesRow = (ASTNode) n;
        assert valuesRow.getToken().getType() == HiveParser.TOK_VALUE_ROW :
            "Expected child of TOK_VALUE_TABLE to be TOK_VALUE_ROW but was " + valuesRow.getName();
        // Each of the children of this should be a literal
        List valuesRowChildren = valuesRow.getChildren();
        boolean isFirst = true;
        int nextColNum = 1;
        for (Node n1 : valuesRowChildren) {
          ASTNode value = (ASTNode) n1;
          if (firstRow) {
            fields.add(new FieldSchema("tmp_values_col" + nextColNum++, "string", ""));
          }
          if (isFirst) isFirst = false;
          else writeAsText("\u0001", out);
          writeAsText(unparseExprForValuesClause(value), out);
        }
        writeAsText("\n", out);
        firstRow = false;
      }

      // Step 2, create a temp table, using the created file as the data
      StorageFormat format = new StorageFormat(conf);
      format.processStorageFormat("TextFile");
      Table table = db.newTable(tableName);
      table.setSerializationLib(format.getSerde());
      table.setFields(fields);
      table.setDataLocation(tablePath);
      table.getTTable().setTemporary(true);
      table.setStoredAsSubDirectories(false);
      table.setInputFormatClass(format.getInputFormat());
      table.setOutputFormatClass(format.getOutputFormat());
      db.createTable(table, false);
    } catch (Exception e) {
      String errMsg = ErrorMsg.INSERT_CANNOT_CREATE_TEMP_FILE.getMsg() + e.getMessage();
      LOG.error(errMsg);
      // Try to delete the file
      if (fs != null && tablePath != null) {
        try {
          fs.delete(tablePath, false);
        } catch (IOException swallowIt) {}
      }
      throw new SemanticException(errMsg, e);
    } finally {
        IOUtils.closeStream(out);
    }

    // Step 3, return a new subtree with a from clause built around that temp table
    // The form of the tree is TOK_TABREF->TOK_TABNAME->identifier(tablename)
    Token t = new ClassicToken(HiveParser.TOK_TABREF);
    ASTNode tabRef = new ASTNode(t);
    t = new ClassicToken(HiveParser.TOK_TABNAME);
    ASTNode tabNameNode = new ASTNode(t);
    tabRef.addChild(tabNameNode);
    t = new ClassicToken(HiveParser.Identifier, tableName);
    ASTNode identifier = new ASTNode(t);
    tabNameNode.addChild(identifier);
    return tabRef;
  }

  // Take an expression in the values clause and turn it back into a string.  This is far from
  // comprehensive.  At the moment it only supports:
  // * literals (all types)
  // * unary negatives
  // * true/false
  private String unparseExprForValuesClause(ASTNode expr) throws SemanticException {
    switch (expr.getToken().getType()) {
      case HiveParser.Number:
        return expr.getText();

      case HiveParser.StringLiteral:
        return BaseSemanticAnalyzer.unescapeSQLString(expr.getText());

      case HiveParser.KW_FALSE:
        // UDFToBoolean casts any non-empty string to true, so set this to false
        return "";

      case HiveParser.KW_TRUE:
        return "TRUE";

      case HiveParser.MINUS:
        return "-" + unparseExprForValuesClause((ASTNode)expr.getChildren().get(0));

      case HiveParser.TOK_NULL:
        // Hive's text input will translate this as a null
        return "\\N";

      default:
        throw new SemanticException("Expression of type " + expr.getText() +
            " not supported in insert/values");
    }

  }

  private void assertCombineInputFormat(Tree numerator, String message) throws SemanticException {
    String inputFormat = conf.getVar(HiveConf.ConfVars.HIVE_EXECUTION_ENGINE).equals("tez") ?
      HiveConf.getVar(conf, HiveConf.ConfVars.HIVETEZINPUTFORMAT):
      HiveConf.getVar(conf, HiveConf.ConfVars.HIVEINPUTFORMAT);
    if (!inputFormat.equals(CombineHiveInputFormat.class.getName())) {
      throw new SemanticException(generateErrorMessage((ASTNode) numerator,
          message + " sampling is not supported in " + inputFormat));
    }
  }

  private String processSubQuery(QB qb, ASTNode subq) throws SemanticException {

    // This is a subquery and must have an alias
    if (subq.getChildCount() != 2) {
      throw new SemanticException(ErrorMsg.NO_SUBQUERY_ALIAS.getMsg(subq));
    }
    ASTNode subqref = (ASTNode) subq.getChild(0);
    String alias = unescapeIdentifier(subq.getChild(1).getText());

    // Recursively do the first phase of semantic analysis for the subquery
    QBExpr qbexpr = new QBExpr(alias);

    doPhase1QBExpr(subqref, qbexpr, qb.getId(), alias, qb.isInsideView());

    // If the alias is already there then we have a conflict
    if (qb.exists(alias)) {
      throw new SemanticException(ErrorMsg.AMBIGUOUS_TABLE_ALIAS.getMsg(subq
          .getChild(1)));
    }
    // Insert this map into the stats
    qb.setSubqAlias(alias, qbexpr);
    qb.addAlias(alias);

    unparseTranslator.addIdentifierTranslation((ASTNode) subq.getChild(1));

    return alias;
  }

  /*
   * Phase1: hold onto any CTE definitions in aliasToCTE.
   * CTE definitions are global to the Query.
   */
  private void processCTE(QB qb, ASTNode ctes) throws SemanticException {

    int numCTEs = ctes.getChildCount();

    for(int i=0; i aliasToCTEs map.
   *
   */
  private CTEClause findCTEFromName(QB qb, String cteName) {
    StringBuilder qId = new StringBuilder();
    if (qb.getId() != null) {
      qId.append(qb.getId());
    }

    while (qId.length() > 0) {
      String nm = qId + ":" + cteName;
      CTEClause cte = aliasToCTEs.get(nm);
      if (cte != null) {
        return cte;
      }
      int lastIndex = qId.lastIndexOf(":");
      lastIndex = lastIndex < 0 ? 0 : lastIndex;
      qId.setLength(lastIndex);
    }
    return aliasToCTEs.get(cteName);
  }

  /*
   * If a CTE is referenced in a QueryBlock:
   * - add it as a SubQuery for now.
   *   - SQ.alias is the alias used in QB. (if no alias is specified,
   *     it used the CTE name. Works just like table references)
   *   - Adding SQ done by:
   *     - copying AST of CTE
   *     - setting ASTOrigin on cloned AST.
   *   - trigger phase 1 on new QBExpr.
   *   - update QB data structs: remove this as a table reference, move it to a SQ invocation.
   */
  private void addCTEAsSubQuery(QB qb, String cteName, String cteAlias)
      throws SemanticException {
    cteAlias = cteAlias == null ? cteName : cteAlias;
    CTEClause cte = findCTEFromName(qb, cteName);
    ASTNode cteQryNode = cte.cteNode;
    QBExpr cteQBExpr = new QBExpr(cteAlias);
    doPhase1QBExpr(cteQryNode, cteQBExpr, qb.getId(), cteAlias);
    qb.rewriteCTEToSubq(cteAlias, cteName, cteQBExpr);
  }

  private final CTEClause rootClause = new CTEClause(null, null);

  @Override
  public List> getAllRootTasks() {
    if (!rootTasksResolved) {
      rootTasks = toRealRootTasks(rootClause.asExecutionOrder());
      rootTasksResolved = true;
    }
    return rootTasks;
  }

  @Override
  public HashSet getAllInputs() {
    HashSet readEntities = new HashSet(getInputs());
    for (CTEClause cte : rootClause.asExecutionOrder()) {
      if (cte.source != null) {
        readEntities.addAll(cte.source.getInputs());
      }
    }
    return readEntities;
  }

  @Override
  public HashSet getAllOutputs() {
    HashSet writeEntities = new HashSet(getOutputs());
    for (CTEClause cte : rootClause.asExecutionOrder()) {
      if (cte.source != null) {
        writeEntities.addAll(cte.source.getOutputs());
      }
    }
    return writeEntities;
  }

  class CTEClause {
    CTEClause(String alias, ASTNode cteNode) {
      this.alias = alias;
      this.cteNode = cteNode;
    }
    String alias;
    ASTNode cteNode;
    boolean materialize;
    int reference;
    QBExpr qbExpr;
    List parents = new ArrayList();

    // materialized
    Table table;
    SemanticAnalyzer source;

    List> getTasks() {
      return source == null ? null : source.rootTasks;
    }

    List asExecutionOrder() {
      List execution = new ArrayList();
      asExecutionOrder(new HashSet(), execution);
      return execution;
    }

    void asExecutionOrder(Set visited, List execution) {
      for (CTEClause parent : parents) {
        if (visited.add(parent)) {
          parent.asExecutionOrder(visited, execution);
        }
      }
      execution.add(this);
    }

    @Override
    public String toString() {
      return alias == null ? "" : alias;
    }
  }

  private List> toRealRootTasks(List execution) {
    List> cteRoots = new ArrayList<>();
    List> cteLeafs = new ArrayList<>();
    List> curTopRoots = null;
    List> curBottomLeafs = null;
    for (int i = 0; i < execution.size(); i++) {
      CTEClause current = execution.get(i);
      if (current.parents.isEmpty() && curTopRoots != null) {
        cteRoots.addAll(curTopRoots);
        cteLeafs.addAll(curBottomLeafs);
        curTopRoots = curBottomLeafs = null;
      }
      List> curTasks = current.getTasks();
      if (curTasks == null) {
        continue;
      }
      if (curTopRoots == null) {
        curTopRoots = curTasks;
      }
      if (curBottomLeafs != null) {
        for (Task topLeafTask : curBottomLeafs) {
          for (Task currentRootTask : curTasks) {
            topLeafTask.addDependentTask(currentRootTask);
          }
        }
      }
      curBottomLeafs = Task.findLeafs(curTasks);
    }
    if (curTopRoots != null) {
      cteRoots.addAll(curTopRoots);
      cteLeafs.addAll(curBottomLeafs);
    }

    if (cteRoots.isEmpty()) {
      return rootTasks;
    }
    for (Task cteLeafTask : cteLeafs) {
      for (Task mainRootTask : rootTasks) {
        cteLeafTask.addDependentTask(mainRootTask);
      }
    }
    return cteRoots;
  }

  Table materializeCTE(String cteName, CTEClause cte) throws HiveException {

    ASTNode createTable = new ASTNode(new ClassicToken(HiveParser.TOK_CREATETABLE));

    ASTNode tableName = new ASTNode(new ClassicToken(HiveParser.TOK_TABNAME));
    tableName.addChild(new ASTNode(new ClassicToken(HiveParser.Identifier, cteName)));

    ASTNode temporary = new ASTNode(new ClassicToken(HiveParser.KW_TEMPORARY, MATERIALIZATION_MARKER));

    createTable.addChild(tableName);
    createTable.addChild(temporary);
    createTable.addChild(cte.cteNode);

    SemanticAnalyzer analyzer = new SemanticAnalyzer(queryState);
    analyzer.initCtx(ctx);
    analyzer.init(false);

    // should share cte contexts
    analyzer.aliasToCTEs.putAll(aliasToCTEs);

    HiveOperation operation = queryState.getHiveOperation();
    try {
      analyzer.analyzeInternal(createTable);
    } finally {
      queryState.setCommandType(operation);
    }

    Table table = analyzer.tableDesc.toTable(conf);
    Path location = table.getDataLocation();
    try {
      location.getFileSystem(conf).mkdirs(location);
    } catch (IOException e) {
      throw new HiveException(e);
    }
    table.setMaterializedTable(true);

    LOG.info(cteName + " will be materialized into " + location);
    cte.table = table;
    cte.source = analyzer;

    ctx.addMaterializedTable(cteName, table);

    return table;
  }


  static boolean isJoinToken(ASTNode node) {
    if ((node.getToken().getType() == HiveParser.TOK_JOIN)
        || (node.getToken().getType() == HiveParser.TOK_CROSSJOIN)
        || isOuterJoinToken(node)
        || (node.getToken().getType() == HiveParser.TOK_LEFTSEMIJOIN)
        || (node.getToken().getType() == HiveParser.TOK_UNIQUEJOIN)) {
      return true;
    }

    return false;
  }

  static private boolean isOuterJoinToken(ASTNode node) {
    return (node.getToken().getType() == HiveParser.TOK_LEFTOUTERJOIN)
      || (node.getToken().getType() == HiveParser.TOK_RIGHTOUTERJOIN)
      || (node.getToken().getType() == HiveParser.TOK_FULLOUTERJOIN);
  }

  /**
   * Given the AST with TOK_JOIN as the root, get all the aliases for the tables
   * or subqueries in the join.
   *
   * @param qb
   * @param join
   * @throws SemanticException
   */
  @SuppressWarnings("nls")
  private void processJoin(QB qb, ASTNode join) throws SemanticException {
    int numChildren = join.getChildCount();
    if ((numChildren != 2) && (numChildren != 3)
        && join.getToken().getType() != HiveParser.TOK_UNIQUEJOIN) {
      throw new SemanticException(generateErrorMessage(join,
          "Join with multiple children"));
    }

    queryProperties.incrementJoinCount(isOuterJoinToken(join));
    for (int num = 0; num < numChildren; num++) {
      ASTNode child = (ASTNode) join.getChild(num);
      if (child.getToken().getType() == HiveParser.TOK_TABREF) {
        processTable(qb, child);
      } else if (child.getToken().getType() == HiveParser.TOK_SUBQUERY) {
        processSubQuery(qb, child);
      } else if (child.getToken().getType() == HiveParser.TOK_PTBLFUNCTION) {
        queryProperties.setHasPTF(true);
        processPTF(qb, child);
        PTFInvocationSpec ptfInvocationSpec = qb.getPTFInvocationSpec(child);
        String inputAlias = ptfInvocationSpec == null ? null :
          ptfInvocationSpec.getFunction().getAlias();;
        if ( inputAlias == null ) {
          throw new SemanticException(generateErrorMessage(child,
              "PTF invocation in a Join must have an alias"));
        }

      } else if (child.getToken().getType() == HiveParser.TOK_LATERAL_VIEW ||
          child.getToken().getType() == HiveParser.TOK_LATERAL_VIEW_OUTER) {
        // SELECT * FROM src1 LATERAL VIEW udtf() AS myTable JOIN src2 ...
        // is not supported. Instead, the lateral view must be in a subquery
        // SELECT * FROM (SELECT * FROM src1 LATERAL VIEW udtf() AS myTable) a
        // JOIN src2 ...
        throw new SemanticException(ErrorMsg.LATERAL_VIEW_WITH_JOIN
            .getMsg(join));
      } else if (isJoinToken(child)) {
        processJoin(qb, child);
      }
    }
  }

  /**
   * Given the AST with TOK_LATERAL_VIEW as the root, get the alias for the
   * table or subquery in the lateral view and also make a mapping from the
   * alias to all the lateral view AST's.
   *
   * @param qb
   * @param lateralView
   * @return the alias for the table/subquery
   * @throws SemanticException
   */

  private String processLateralView(QB qb, ASTNode lateralView)
      throws SemanticException {
    int numChildren = lateralView.getChildCount();

    assert (numChildren == 2);
    ASTNode next = (ASTNode) lateralView.getChild(1);

    String alias = null;

    switch (next.getToken().getType()) {
    case HiveParser.TOK_TABREF:
      alias = processTable(qb, next);
      break;
    case HiveParser.TOK_SUBQUERY:
      alias = processSubQuery(qb, next);
      break;
    case HiveParser.TOK_LATERAL_VIEW:
    case HiveParser.TOK_LATERAL_VIEW_OUTER:
      alias = processLateralView(qb, next);
      break;
    default:
      throw new SemanticException(ErrorMsg.LATERAL_VIEW_INVALID_CHILD
          .getMsg(lateralView));
    }
    alias = alias.toLowerCase();
    qb.getParseInfo().addLateralViewForAlias(alias, lateralView);
    qb.addAlias(alias);
    return alias;
  }

  /**
   * Phase 1: (including, but not limited to):
   *
   * 1. Gets all the aliases for all the tables / subqueries and makes the
   * appropriate mapping in aliasToTabs, aliasToSubq 2. Gets the location of the
   * destination and names the clause "inclause" + i 3. Creates a map from a
   * string representation of an aggregation tree to the actual aggregation AST
   * 4. Creates a mapping from the clause name to the select expression AST in
   * destToSelExpr 5. Creates a mapping from a table alias to the lateral view
   * AST's in aliasToLateralViews
   *
   * @param ast
   * @param qb
   * @param ctx_1
   * @throws SemanticException
   */
  @SuppressWarnings({"fallthrough", "nls"})
  public boolean doPhase1(ASTNode ast, QB qb, Phase1Ctx ctx_1, PlannerContext plannerCtx)
      throws SemanticException {

    boolean phase1Result = true;
    QBParseInfo qbp = qb.getParseInfo();
    boolean skipRecursion = false;

    if (ast.getToken() != null) {
      skipRecursion = true;
      switch (ast.getToken().getType()) {
      case HiveParser.TOK_SELECTDI:
        qb.countSelDi();
        // fall through
      case HiveParser.TOK_SELECT:
        qb.countSel();
        qbp.setSelExprForClause(ctx_1.dest, ast);

        int posn = 0;
        if (((ASTNode) ast.getChild(0)).getToken().getType() == HiveParser.QUERY_HINT) {
          ParseDriver pd = new ParseDriver();
          String queryHintStr = ast.getChild(0).getText();
          if (LOG.isDebugEnabled()) {
            LOG.debug("QUERY HINT: "+queryHintStr);
          }
          try {
            ASTNode hintNode = pd.parseHint(queryHintStr);
            qbp.setHints((ASTNode) hintNode);
            posn++;
          } catch (ParseException e) {
            throw new SemanticException("failed to parse query hint: "+e.getMessage(), e);
          }
        }

        if ((ast.getChild(posn).getChild(0).getType() == HiveParser.TOK_TRANSFORM))
          queryProperties.setUsesScript(true);

        LinkedHashMap aggregations = doPhase1GetAggregationsFromSelect(ast,
            qb, ctx_1.dest);
        doPhase1GetColumnAliasesFromSelect(ast, qbp);
        qbp.setAggregationExprsForClause(ctx_1.dest, aggregations);
        qbp.setDistinctFuncExprsForClause(ctx_1.dest,
          doPhase1GetDistinctFuncExprs(aggregations));
        break;

      case HiveParser.TOK_WHERE:
        qbp.setWhrExprForClause(ctx_1.dest, ast);
        if (!SubQueryUtils.findSubQueries((ASTNode) ast.getChild(0)).isEmpty())
            queryProperties.setFilterWithSubQuery(true);
        break;

      case HiveParser.TOK_INSERT_INTO:
        String currentDatabase = SessionState.get().getCurrentDatabase();
        String tab_name = getUnescapedName((ASTNode) ast.getChild(0).getChild(0), currentDatabase);
        qbp.addInsertIntoTable(tab_name, ast);

      case HiveParser.TOK_DESTINATION:
        ctx_1.dest = this.ctx.getDestNamePrefix(ast).toString() + ctx_1.nextNum;
        ctx_1.nextNum++;
        boolean isTmpFileDest = false;
        if (ast.getChildCount() > 0 && ast.getChild(0) instanceof ASTNode) {
          ASTNode ch = (ASTNode) ast.getChild(0);
          if (ch.getToken().getType() == HiveParser.TOK_DIR && ch.getChildCount() > 0
              && ch.getChild(0) instanceof ASTNode) {
            ch = (ASTNode) ch.getChild(0);
            isTmpFileDest = ch.getToken().getType() == HiveParser.TOK_TMP_FILE;
          } else {
            if (ast.getToken().getType() == HiveParser.TOK_DESTINATION
                && ast.getChild(0).getType() == HiveParser.TOK_TAB) {
              String fullTableName = getUnescapedName((ASTNode) ast.getChild(0).getChild(0),
                  SessionState.get().getCurrentDatabase());
              qbp.getInsertOverwriteTables().put(fullTableName, ast);
            }
          }
        }

        // is there a insert in the subquery
        if (qbp.getIsSubQ() && !isTmpFileDest) {
          throw new SemanticException(ErrorMsg.NO_INSERT_INSUBQUERY.getMsg(ast));
        }

        qbp.setDestForClause(ctx_1.dest, (ASTNode) ast.getChild(0));
        handleInsertStatementSpecPhase1(ast, qbp, ctx_1);

        if (qbp.getClauseNamesForDest().size() == 2) {
          // From the moment that we have two destination clauses,
          // we know that this is a multi-insert query.
          // Thus, set property to right value.
          // Using qbp.getClauseNamesForDest().size() >= 2 would be
          // equivalent, but we use == to avoid setting the property
          // multiple times
          queryProperties.setMultiDestQuery(true);
        }

        if (plannerCtx != null && !queryProperties.hasMultiDestQuery()) {
          plannerCtx.setInsertToken(ast, isTmpFileDest);
        } else if (plannerCtx != null && qbp.getClauseNamesForDest().size() == 2) {
          // For multi-insert query, currently we only optimize the FROM clause.
          // Hence, introduce multi-insert token on top of it.
          // However, first we need to reset existing token (insert).
          // Using qbp.getClauseNamesForDest().size() >= 2 would be
          // equivalent, but we use == to avoid setting the property
          // multiple times
          plannerCtx.resetToken();
          plannerCtx.setMultiInsertToken((ASTNode) qbp.getQueryFrom().getChild(0));
        }
        break;

      case HiveParser.TOK_FROM:
        int child_count = ast.getChildCount();
        if (child_count != 1) {
          throw new SemanticException(generateErrorMessage(ast,
              "Multiple Children " + child_count));
        }

        if (!qbp.getIsSubQ()) {
          qbp.setQueryFromExpr(ast);
        }

        // Check if this is a subquery / lateral view
        ASTNode frm = (ASTNode) ast.getChild(0);
        if (frm.getToken().getType() == HiveParser.TOK_TABREF) {
          processTable(qb, frm);
        } else if (frm.getToken().getType() == HiveParser.TOK_VIRTUAL_TABLE) {
          // Create a temp table with the passed values in it then rewrite this portion of the
          // tree to be from that table.
          ASTNode newFrom = genValuesTempTable(frm, qb);
          ast.setChild(0, newFrom);
          processTable(qb, newFrom);
        } else if (frm.getToken().getType() == HiveParser.TOK_SUBQUERY) {
          processSubQuery(qb, frm);
        } else if (frm.getToken().getType() == HiveParser.TOK_LATERAL_VIEW ||
            frm.getToken().getType() == HiveParser.TOK_LATERAL_VIEW_OUTER) {
          queryProperties.setHasLateralViews(true);
          processLateralView(qb, frm);
        } else if (isJoinToken(frm)) {
          processJoin(qb, frm);
          qbp.setJoinExpr(frm);
        }else if(frm.getToken().getType() == HiveParser.TOK_PTBLFUNCTION){
          queryProperties.setHasPTF(true);
          processPTF(qb, frm);
        }
        break;

      case HiveParser.TOK_CLUSTERBY:
        // Get the clusterby aliases - these are aliased to the entries in the
        // select list
        queryProperties.setHasClusterBy(true);
        qbp.setClusterByExprForClause(ctx_1.dest, ast);
        break;

      case HiveParser.TOK_DISTRIBUTEBY:
        // Get the distribute by aliases - these are aliased to the entries in
        // the
        // select list
        queryProperties.setHasDistributeBy(true);
        qbp.setDistributeByExprForClause(ctx_1.dest, ast);
        if (qbp.getClusterByForClause(ctx_1.dest) != null) {
          throw new SemanticException(generateErrorMessage(ast,
              ErrorMsg.CLUSTERBY_DISTRIBUTEBY_CONFLICT.getMsg()));
        } else if (qbp.getOrderByForClause(ctx_1.dest) != null) {
          throw new SemanticException(generateErrorMessage(ast,
              ErrorMsg.ORDERBY_DISTRIBUTEBY_CONFLICT.getMsg()));
        }
        break;

      case HiveParser.TOK_SORTBY:
     // Get the sort by aliases - these are aliased to the entries in the
        // select list
        queryProperties.setHasSortBy(true);
        qbp.setSortByExprForClause(ctx_1.dest, ast);
        if (qbp.getClusterByForClause(ctx_1.dest) != null) {
          throw new SemanticException(generateErrorMessage(ast,
              ErrorMsg.CLUSTERBY_SORTBY_CONFLICT.getMsg()));
        } else if (qbp.getOrderByForClause(ctx_1.dest) != null) {
          throw new SemanticException(generateErrorMessage(ast,
              ErrorMsg.ORDERBY_SORTBY_CONFLICT.getMsg()));
        }

        break;

      case HiveParser.TOK_ORDERBY:
        // Get the order by aliases - these are aliased to the entries in the
        // select list
        queryProperties.setHasOrderBy(true);
        qbp.setOrderByExprForClause(ctx_1.dest, ast);
        if (qbp.getClusterByForClause(ctx_1.dest) != null) {
          throw new SemanticException(generateErrorMessage(ast,
              ErrorMsg.CLUSTERBY_ORDERBY_CONFLICT.getMsg()));
        }
        break;

      case HiveParser.TOK_GROUPBY:
      case HiveParser.TOK_ROLLUP_GROUPBY:
      case HiveParser.TOK_CUBE_GROUPBY:
      case HiveParser.TOK_GROUPING_SETS:
        // Get the groupby aliases - these are aliased to the entries in the
        // select list
        queryProperties.setHasGroupBy(true);
        if (qbp.getJoinExpr() != null) {
          queryProperties.setHasJoinFollowedByGroupBy(true);
        }
        if (qbp.getSelForClause(ctx_1.dest).getToken().getType() == HiveParser.TOK_SELECTDI) {
          throw new SemanticException(generateErrorMessage(ast,
              ErrorMsg.SELECT_DISTINCT_WITH_GROUPBY.getMsg()));
        }
        qbp.setGroupByExprForClause(ctx_1.dest, ast);
        skipRecursion = true;

        // Rollup and Cubes are syntactic sugar on top of grouping sets
        if (ast.getToken().getType() == HiveParser.TOK_ROLLUP_GROUPBY) {
          qbp.getDestRollups().add(ctx_1.dest);
        } else if (ast.getToken().getType() == HiveParser.TOK_CUBE_GROUPBY) {
          qbp.getDestCubes().add(ctx_1.dest);
        } else if (ast.getToken().getType() == HiveParser.TOK_GROUPING_SETS) {
          qbp.getDestGroupingSets().add(ctx_1.dest);
        }
        break;

      case HiveParser.TOK_HAVING:
        qbp.setHavingExprForClause(ctx_1.dest, ast);
        qbp.addAggregationExprsForClause(ctx_1.dest,
            doPhase1GetAggregationsFromSelect(ast, qb, ctx_1.dest));
        break;

      case HiveParser.KW_WINDOW:
        if (!qb.hasWindowingSpec(ctx_1.dest) ) {
          throw new SemanticException(generateErrorMessage(ast,
              "Query has no Cluster/Distribute By; but has a Window definition"));
        }
        handleQueryWindowClauses(qb, ctx_1, ast);
        break;

      case HiveParser.TOK_LIMIT:
        if (ast.getChildCount() == 2) {
          qbp.setDestLimit(ctx_1.dest,
              new Integer(ast.getChild(0).getText()),
              new Integer(ast.getChild(1).getText()));
        } else {
          qbp.setDestLimit(ctx_1.dest, new Integer(0),
              new Integer(ast.getChild(0).getText()));
        }
        break;

      case HiveParser.TOK_ANALYZE:
        // Case of analyze command

        String table_name = getUnescapedName((ASTNode) ast.getChild(0).getChild(0)).toLowerCase();


        qb.setTabAlias(table_name, table_name);
        qb.addAlias(table_name);
        qb.getParseInfo().setIsAnalyzeCommand(true);
        qb.getParseInfo().setNoScanAnalyzeCommand(this.noscan);
        qb.getParseInfo().setPartialScanAnalyzeCommand(this.partialscan);
        // Allow analyze the whole table and dynamic partitions
        HiveConf.setVar(conf, HiveConf.ConfVars.DYNAMICPARTITIONINGMODE, "nonstrict");
        HiveConf.setVar(conf, HiveConf.ConfVars.HIVEMAPREDMODE, "nonstrict");

        break;

      case HiveParser.TOK_UNIONALL:
        if (!qbp.getIsSubQ()) {
          // this shouldn't happen. The parser should have converted the union to be
          // contained in a subquery. Just in case, we keep the error as a fallback.
          throw new SemanticException(generateErrorMessage(ast,
              ErrorMsg.UNION_NOTIN_SUBQ.getMsg()));
        }
        skipRecursion = false;
        break;

      case HiveParser.TOK_INSERT:
        ASTNode destination = (ASTNode) ast.getChild(0);
        Tree tab = destination.getChild(0);

        // Proceed if AST contains partition & If Not Exists
        if (destination.getChildCount() == 2 &&
            tab.getChildCount() == 2 &&
            destination.getChild(1).getType() == HiveParser.TOK_IFNOTEXISTS) {
          String tableName = tab.getChild(0).getChild(0).getText();

          Tree partitions = tab.getChild(1);
          int childCount = partitions.getChildCount();
          HashMap partition = new HashMap();
          for (int i = 0; i < childCount; i++) {
            String partitionName = partitions.getChild(i).getChild(0).getText();
            Tree pvalue = partitions.getChild(i).getChild(1);
            if (pvalue == null) {
              break;
            }
            String partitionVal = stripQuotes(pvalue.getText());
            partition.put(partitionName, partitionVal);
          }
          // if it is a dynamic partition throw the exception
          if (childCount != partition.size()) {
            throw new SemanticException(ErrorMsg.INSERT_INTO_DYNAMICPARTITION_IFNOTEXISTS
                .getMsg(partition.toString()));
          }
          Table table = null;
          try {
            table = this.getTableObjectByName(tableName);
          } catch (HiveException ex) {
            throw new SemanticException(ex);
          }
          try {
            Partition parMetaData = db.getPartition(table, partition, false);
            // Check partition exists if it exists skip the overwrite
            if (parMetaData != null) {
              phase1Result = false;
              skipRecursion = true;
              LOG.info("Partition already exists so insert into overwrite " +
                  "skipped for partition : " + parMetaData.toString());
              break;
            }
          } catch (HiveException e) {
            LOG.info("Error while getting metadata : ", e);
          }
          validatePartSpec(table, partition, (ASTNode)tab, conf, false);
        }
        skipRecursion = false;
        break;
      case HiveParser.TOK_LATERAL_VIEW:
      case HiveParser.TOK_LATERAL_VIEW_OUTER:
        // todo: nested LV
        assert ast.getChildCount() == 1;
        qb.getParseInfo().getDestToLateralView().put(ctx_1.dest, ast);
        break;
      case HiveParser.TOK_CTE:
        processCTE(qb, ast);
        break;
      default:
        skipRecursion = false;
        break;
      }
    }

    if (!skipRecursion) {
      // Iterate over the rest of the children
      int child_count = ast.getChildCount();
      for (int child_pos = 0; child_pos < child_count && phase1Result; ++child_pos) {
        // Recurse
        phase1Result = phase1Result && doPhase1(
            (ASTNode)ast.getChild(child_pos), qb, ctx_1, plannerCtx);
      }
    }
    return phase1Result;
  }

  /**
   * This is phase1 of supporting specifying schema in insert statement
   * insert into foo(z,y) select a,b from bar;
   * @see #handleInsertStatementSpec(java.util.List, String, RowResolver, RowResolver, QB, ASTNode)
   * @throws SemanticException
   */
  private void handleInsertStatementSpecPhase1(ASTNode ast, QBParseInfo qbp, Phase1Ctx ctx_1) throws SemanticException {
    ASTNode tabColName = (ASTNode)ast.getChild(1);
    if(ast.getType() == HiveParser.TOK_INSERT_INTO && tabColName != null && tabColName.getType() == HiveParser.TOK_TABCOLNAME) {
      //we have "insert into foo(a,b)..."; parser will enforce that 1+ columns are listed if TOK_TABCOLNAME is present
      List targetColNames = new ArrayList();
      for(Node col : tabColName.getChildren()) {
        assert ((ASTNode)col).getType() == HiveParser.Identifier :
          "expected token " + HiveParser.Identifier + " found " + ((ASTNode)col).getType();
        targetColNames.add(((ASTNode)col).getText());
      }
      String fullTableName = getUnescapedName((ASTNode) ast.getChild(0).getChild(0),
        SessionState.get().getCurrentDatabase());
      qbp.setDestSchemaForClause(ctx_1.dest, targetColNames);
      Set targetColumns = new HashSet();
      targetColumns.addAll(targetColNames);
      if(targetColNames.size() != targetColumns.size()) {
        throw new SemanticException(generateErrorMessage(tabColName,
          "Duplicate column name detected in " + fullTableName + " table schema specification"));
      }
      Table targetTable = null;
      try {
        targetTable = db.getTable(fullTableName, false);
      }
      catch (HiveException ex) {
        LOG.error("Error processing HiveParser.TOK_DESTINATION: " + ex.getMessage(), ex);
        throw new SemanticException(ex);
      }
      if(targetTable == null) {
        throw new SemanticException(generateErrorMessage(ast,
          "Unable to access metadata for table " + fullTableName));
      }
      for(FieldSchema f : targetTable.getCols()) {
        //parser only allows foo(a,b), not foo(foo.a, foo.b)
        targetColumns.remove(f.getName());
      }
      if(!targetColumns.isEmpty()) {//here we need to see if remaining columns are dynamic partition columns
            /* We just checked the user specified schema columns among regular table column and found some which are not
            'regular'.  Now check is they are dynamic partition columns
              For dynamic partitioning,
              Given "create table multipart(a int, b int) partitioned by (c int, d int);"
              for "insert into multipart partition(c='1',d)(d,a) values(2,3);" we expect parse tree to look like this
               (TOK_INSERT_INTO
                (TOK_TAB
                  (TOK_TABNAME multipart)
                  (TOK_PARTSPEC
                    (TOK_PARTVAL c '1')
                    (TOK_PARTVAL d)
                  )
                )
                (TOK_TABCOLNAME d a)
               )*/
        List dynamicPartitionColumns = new ArrayList();
        if(ast.getChild(0) != null && ast.getChild(0).getType() == HiveParser.TOK_TAB) {
          ASTNode tokTab = (ASTNode)ast.getChild(0);
          ASTNode tokPartSpec = (ASTNode)tokTab.getFirstChildWithType(HiveParser.TOK_PARTSPEC);
          if(tokPartSpec != null) {
            for(Node n : tokPartSpec.getChildren()) {
              ASTNode tokPartVal = null;
              if(n instanceof ASTNode) {
                tokPartVal = (ASTNode)n;
              }
              if(tokPartVal != null && tokPartVal.getType() == HiveParser.TOK_PARTVAL && tokPartVal.getChildCount() == 1) {
                assert tokPartVal.getChild(0).getType() == HiveParser.Identifier :
                  "Expected column name; found tokType=" + tokPartVal.getType();
                dynamicPartitionColumns.add(tokPartVal.getChild(0).getText());
              }
            }
          }
        }
        for(String colName : dynamicPartitionColumns) {
          targetColumns.remove(colName);
        }
        if(!targetColumns.isEmpty()) {
          //Found some columns in user specified schema which are neither regular not dynamic partition columns
          throw new SemanticException(generateErrorMessage(tabColName,
            "'" + (targetColumns.size() == 1 ? targetColumns.iterator().next() : targetColumns) +
              "' in insert schema specification " + (targetColumns.size() == 1 ? "is" : "are") +
              " not found among regular columns of " +
              fullTableName + " nor dynamic partition columns."));
        }
      }
    }
  }

  public void getMaterializationMetadata(QB qb) throws SemanticException {
    try {
      gatherCTEReferences(qb, rootClause);
      int threshold = HiveConf.getIntVar(conf, HiveConf.ConfVars.HIVE_CTE_MATERIALIZE_THRESHOLD);
      for (CTEClause cte : Sets.newHashSet(aliasToCTEs.values())) {
        if (threshold >= 0 && cte.reference >= threshold) {
          cte.materialize = true;
        }
      }
    } catch (HiveException e) {
      // Has to use full name to make sure it does not conflict with
      // org.apache.commons.lang.StringUtils
      LOG.error(org.apache.hadoop.util.StringUtils.stringifyException(e));
      if (e instanceof SemanticException) {
        throw (SemanticException)e;
      }
      throw new SemanticException(e.getMessage(), e);
    }
  }

  private void gatherCTEReferences(QBExpr qbexpr, CTEClause parent) throws HiveException {
    if (qbexpr.getOpcode() == QBExpr.Opcode.NULLOP) {
      gatherCTEReferences(qbexpr.getQB(), parent);
    } else {
      gatherCTEReferences(qbexpr.getQBExpr1(), parent);
      gatherCTEReferences(qbexpr.getQBExpr2(), parent);
    }
  }

  // TODO: check view references, too
  private void gatherCTEReferences(QB qb, CTEClause current) throws HiveException {
    for (String alias : qb.getTabAliases()) {
      String tabName = qb.getTabNameForAlias(alias);
      String cteName = tabName.toLowerCase();

      CTEClause cte = findCTEFromName(qb, cteName);
      if (cte != null) {
        if (ctesExpanded.contains(cteName)) {
          throw new SemanticException("Recursive cte " + cteName +
                  " detected (cycle: " + StringUtils.join(ctesExpanded, " -> ") +
                  " -> " + cteName + ").");
        }
        cte.reference++;
        current.parents.add(cte);
        if (cte.qbExpr != null) {
          continue;
        }
        cte.qbExpr = new QBExpr(cteName);
        doPhase1QBExpr(cte.cteNode, cte.qbExpr, qb.getId(), cteName);

        ctesExpanded.add(cteName);
        gatherCTEReferences(cte.qbExpr, cte);
        ctesExpanded.remove(ctesExpanded.size() - 1);
      }
    }
    for (String alias : qb.getSubqAliases()) {
      gatherCTEReferences(qb.getSubqForAlias(alias), current);
    }
  }

  public void getMetaData(QB qb) throws SemanticException {
    getMetaData(qb, false);
  }

  public void getMetaData(QB qb, boolean enableMaterialization) throws SemanticException {
    try {
      if (enableMaterialization) {
        getMaterializationMetadata(qb);
      }
      getMetaData(qb, null);
    } catch (HiveException e) {
      // Has to use full name to make sure it does not conflict with
      // org.apache.commons.lang.StringUtils
      LOG.error(org.apache.hadoop.util.StringUtils.stringifyException(e));
      if (e instanceof SemanticException) {
        throw (SemanticException)e;
      }
      throw new SemanticException(e.getMessage(), e);
    }
  }

  private void getMetaData(QBExpr qbexpr, ReadEntity parentInput)
          throws HiveException {
    if (qbexpr.getOpcode() == QBExpr.Opcode.NULLOP) {
      getMetaData(qbexpr.getQB(), parentInput);
    } else {
      getMetaData(qbexpr.getQBExpr1(), parentInput);
      getMetaData(qbexpr.getQBExpr2(), parentInput);
    }
  }

  @SuppressWarnings("nls")
  private void getMetaData(QB qb, ReadEntity parentInput)
          throws HiveException {
    LOG.info("Get metadata for source tables");

    // Go over the tables and populate the related structures.
    // We have to materialize the table alias list since we might
    // modify it in the middle for view rewrite.
    List tabAliases = new ArrayList(qb.getTabAliases());

    // Keep track of view alias to view name and read entity
    // For eg: for a query like 'select * from V3', where V3 -> V2, V2 -> V1, V1 -> T
    // keeps track of full view name and read entity corresponding to alias V3, V3:V2, V3:V2:V1.
    // This is needed for tracking the dependencies for inputs, along with their parents.
    Map> aliasToViewInfo =
        new HashMap>();

    /*
     * used to capture view to SQ conversions. This is used to check for
     * recursive CTE invocations.
     */
    Map sqAliasToCTEName = new HashMap();

    for (String alias : tabAliases) {
      String tabName = qb.getTabNameForAlias(alias);
      String cteName = tabName.toLowerCase();

      Table tab = db.getTable(tabName, false);
      if (tab == null ||
              tab.getDbName().equals(SessionState.get().getCurrentDatabase())) {
        Table materializedTab = ctx.getMaterializedTable(cteName);
        if (materializedTab == null) {
          // we first look for this alias from CTE, and then from catalog.
          CTEClause cte = findCTEFromName(qb, cteName);
          if (cte != null) {
            if (!cte.materialize) {
              addCTEAsSubQuery(qb, cteName, alias);
              sqAliasToCTEName.put(alias, cteName);
              continue;
            }
            tab = materializeCTE(cteName, cte);
          }
        } else {
          tab = materializedTab;
        }
      }

      if (tab == null) {
        ASTNode src = qb.getParseInfo().getSrcForAlias(alias);
        if (null != src) {
          throw new SemanticException(ErrorMsg.INVALID_TABLE.getMsg(src));
        } else {
          throw new SemanticException(ErrorMsg.INVALID_TABLE.getMsg(alias));
        }
      }
     if (tab.isView()) {
        if (qb.getParseInfo().isAnalyzeCommand()) {
          throw new SemanticException(ErrorMsg.ANALYZE_VIEW.getMsg());
        }
        String fullViewName = tab.getDbName() + "." + tab.getTableName();
        // Prevent view cycles
        if (viewsExpanded.contains(fullViewName)) {
          throw new SemanticException("Recursive view " + fullViewName +
              " detected (cycle: " + StringUtils.join(viewsExpanded, " -> ") +
              " -> " + fullViewName + ").");
        }
        replaceViewReferenceWithDefinition(qb, tab, tabName, alias);
        // This is the last time we'll see the Table objects for views, so add it to the inputs
        // now. isInsideView will tell if this view is embedded in another view.
        // If the view is Inside another view, it should have at least one parent
        if (qb.isInsideView() && parentInput == null) {
          parentInput = PlanUtils.getParentViewInfo(getAliasId(alias, qb), viewAliasToInput);
        }
        ReadEntity viewInput = new ReadEntity(tab, parentInput, !qb.isInsideView());
        viewInput = PlanUtils.addInput(inputs, viewInput);
        aliasToViewInfo.put(alias, new ObjectPair(fullViewName, viewInput));
        String aliasId = getAliasId(alias, qb);
        if (aliasId != null) {
          aliasId = aliasId.replace(SemanticAnalyzer.SUBQUERY_TAG_1, "")
            .replace(SemanticAnalyzer.SUBQUERY_TAG_2, "");
        }
        viewAliasToInput.put(aliasId, viewInput);
        continue;
      }

      if (!InputFormat.class.isAssignableFrom(tab.getInputFormatClass())) {
        throw new SemanticException(generateErrorMessage(
                qb.getParseInfo().getSrcForAlias(alias),
                ErrorMsg.INVALID_INPUT_FORMAT_TYPE.getMsg()));
      }

      qb.getMetaData().setSrcForAlias(alias, tab);

      if (qb.getParseInfo().isAnalyzeCommand()) {
        // allow partial partition specification for nonscan since noscan is fast.
        TableSpec ts = new TableSpec(db, conf, (ASTNode) ast.getChild(0), true, this.noscan);
        if (ts.specType == SpecType.DYNAMIC_PARTITION) { // dynamic partitions
          try {
            ts.partitions = db.getPartitionsByNames(ts.tableHandle, ts.partSpec);
          } catch (HiveException e) {
            throw new SemanticException(generateErrorMessage(
                    qb.getParseInfo().getSrcForAlias(alias),
                    "Cannot get partitions for " + ts.partSpec), e);
          }
        }
        // validate partial scan command
        QBParseInfo qbpi = qb.getParseInfo();
        if (qbpi.isPartialScanAnalyzeCommand()) {
          Class inputFormatClass = null;
          switch (ts.specType) {
            case TABLE_ONLY:
            case DYNAMIC_PARTITION:
              inputFormatClass = ts.tableHandle.getInputFormatClass();
              break;
            case STATIC_PARTITION:
              inputFormatClass = ts.partHandle.getInputFormatClass();
              break;
            default:
              assert false;
          }
          // throw a HiveException for formats other than rcfile or orcfile.
          if (!(inputFormatClass.equals(RCFileInputFormat.class) || inputFormatClass
                  .equals(OrcInputFormat.class))) {
            throw new SemanticException(ErrorMsg.ANALYZE_TABLE_PARTIALSCAN_NON_RCFILE.getMsg());
          }
        }

        tab.setTableSpec(ts);
        qb.getParseInfo().addTableSpec(alias, ts);
      }

      ReadEntity parentViewInfo = PlanUtils.getParentViewInfo(getAliasId(alias, qb), viewAliasToInput);
      // Temporary tables created during the execution are not the input sources
      if (!PlanUtils.isValuesTempTable(alias)) {
        PlanUtils.addInput(inputs,
                new ReadEntity(tab, parentViewInfo, parentViewInfo == null),mergeIsDirect);
      }
    }

    LOG.info("Get metadata for subqueries");
    // Go over the subqueries and getMetaData for these
    for (String alias : qb.getSubqAliases()) {
      boolean wasView = aliasToViewInfo.containsKey(alias);
      boolean wasCTE = sqAliasToCTEName.containsKey(alias);
      ReadEntity newParentInput = null;
      if (wasView) {
        viewsExpanded.add(aliasToViewInfo.get(alias).getFirst());
        newParentInput = aliasToViewInfo.get(alias).getSecond();
      } else if (wasCTE) {
        ctesExpanded.add(sqAliasToCTEName.get(alias));
      }
      QBExpr qbexpr = qb.getSubqForAlias(alias);
      getMetaData(qbexpr, newParentInput);
      if (wasView) {
        viewsExpanded.remove(viewsExpanded.size() - 1);
      } else if (wasCTE) {
        ctesExpanded.remove(ctesExpanded.size() - 1);
      }
    }

    RowFormatParams rowFormatParams = new RowFormatParams();
    StorageFormat storageFormat = new StorageFormat(conf);

    LOG.info("Get metadata for destination tables");
    // Go over all the destination structures and populate the related
    // metadata
    QBParseInfo qbp = qb.getParseInfo();

    for (String name : qbp.getClauseNamesForDest()) {
      ASTNode ast = qbp.getDestForClause(name);
      switch (ast.getToken().getType()) {
        case HiveParser.TOK_TAB: {
          TableSpec ts = new TableSpec(db, conf, ast);
          if (ts.tableHandle.isView() || ts.tableHandle.isMaterializedView()) {
            throw new SemanticException(ErrorMsg.DML_AGAINST_VIEW.getMsg());
          }

          Class outputFormatClass = ts.tableHandle.getOutputFormatClass();
          if (!ts.tableHandle.isNonNative() &&
              !HiveOutputFormat.class.isAssignableFrom(outputFormatClass)) {
            throw new SemanticException(ErrorMsg.INVALID_OUTPUT_FORMAT_TYPE
                .getMsg(ast, "The class is " + outputFormatClass.toString()));
          }

          boolean isTableWrittenTo = qb.getParseInfo().isInsertIntoTable(ts.tableHandle.getDbName(),
            ts.tableHandle.getTableName());
          isTableWrittenTo |= (qb.getParseInfo().getInsertOverwriteTables().
            get(getUnescapedName((ASTNode) ast.getChild(0), ts.tableHandle.getDbName())) != null);
          assert isTableWrittenTo :
            "Inconsistent data structure detected: we are writing to " + ts.tableHandle  + " in " +
              name + " but it's not in isInsertIntoTable() or getInsertOverwriteTables()";
          // Disallow update and delete on non-acid tables
          boolean isAcid = AcidUtils.isAcidTable(ts.tableHandle);
          if ((updating(name) || deleting(name)) && !isAcid) {
            // Whether we are using an acid compliant transaction manager has already been caught in
            // UpdateDeleteSemanticAnalyzer, so if we are updating or deleting and getting nonAcid
            // here, it means the table itself doesn't support it.
            throw new SemanticException(ErrorMsg.ACID_OP_ON_NONACID_TABLE, ts.tableName);
          }
          // TableSpec ts is got from the query (user specified),
          // which means the user didn't specify partitions in their query,
          // but whether the table itself is partitioned is not know.
          if (ts.specType != SpecType.STATIC_PARTITION) {
            // This is a table or dynamic partition
            qb.getMetaData().setDestForAlias(name, ts.tableHandle);
            // has dynamic as well as static partitions
            if (ts.partSpec != null && ts.partSpec.size() > 0) {
              qb.getMetaData().setPartSpecForAlias(name, ts.partSpec);
            }
          } else {
            // This is a partition
            qb.getMetaData().setDestForAlias(name, ts.partHandle);
          }
          if (HiveConf.getBoolVar(conf, HiveConf.ConfVars.HIVESTATSAUTOGATHER)) {
            // Add the table spec for the destination table.
            qb.getParseInfo().addTableSpec(ts.tableName.toLowerCase(), ts);
          }
          break;
        }

        case HiveParser.TOK_DIR: {
          // This is a dfs file
          String fname = stripQuotes(ast.getChild(0).getText());
          if ((!qb.getParseInfo().getIsSubQ())
              && (((ASTNode) ast.getChild(0)).getToken().getType() == HiveParser.TOK_TMP_FILE)) {

            if (qb.isCTAS() || qb.isMaterializedView()) {
              qb.setIsQuery(false);
              ctx.setResDir(null);
              ctx.setResFile(null);

              Path location;
              // If the CTAS query does specify a location, use the table location, else use the db location
              if (qb.getTableDesc() != null && qb.getTableDesc().getLocation() != null) {
                location = new Path(qb.getTableDesc().getLocation());
              } else {
                // allocate a temporary output dir on the location of the table
                String tableName = getUnescapedName((ASTNode) ast.getChild(0));
                String[] names = Utilities.getDbTableName(tableName);
                try {
                  Warehouse wh = new Warehouse(conf);
                  //Use destination table's db location.
                  String destTableDb = qb.getTableDesc() != null ? qb.getTableDesc().getDatabaseName() : null;
                  if (destTableDb == null) {
                    destTableDb = names[0];
                  }
                  location = wh.getDatabasePath(db.getDatabase(destTableDb));
                } catch (MetaException e) {
                  throw new SemanticException(e);
                }
              }
              try {
                fname = ctx.getExtTmpPathRelTo(
                    FileUtils.makeQualified(location, conf)).toString();
              } catch (Exception e) {
                throw new SemanticException(generateErrorMessage(ast,
                    "Error creating temporary folder on: " + location.toString()), e);
              }
              if (HiveConf.getBoolVar(conf, HiveConf.ConfVars.HIVESTATSAUTOGATHER)) {
                TableSpec ts = new TableSpec(db, conf, this.ast);
                // Add the table spec for the destination table.
                qb.getParseInfo().addTableSpec(ts.tableName.toLowerCase(), ts);
              }
            } else {
              // This is the only place where isQuery is set to true; it defaults to false.
              qb.setIsQuery(true);
              Path stagingPath = getStagingDirectoryPathname(qb);
              fname = stagingPath.toString();
              ctx.setResDir(stagingPath);
            }
          }

          boolean isDfsFile = true;
          if (ast.getChildCount() >= 2 && ast.getChild(1).getText().toLowerCase().equals("local")) {
            isDfsFile = false;
          }
          // Set the destination for the SELECT query inside the CTAS
          qb.getMetaData().setDestForAlias(name, fname, isDfsFile);

          CreateTableDesc directoryDesc = new CreateTableDesc();
          boolean directoryDescIsSet = false;
          int numCh = ast.getChildCount();
          for (int num = 1; num < numCh ; num++){
            ASTNode child = (ASTNode) ast.getChild(num);
            if (child != null) {
              if (storageFormat.fillStorageFormat(child)) {
                directoryDesc.setOutputFormat(storageFormat.getOutputFormat());
                directoryDesc.setSerName(storageFormat.getSerde());
                directoryDescIsSet = true;
                continue;
              }
              switch (child.getToken().getType()) {
                case HiveParser.TOK_TABLEROWFORMAT:
                  rowFormatParams.analyzeRowFormat(child);
                  directoryDesc.setFieldDelim(rowFormatParams.fieldDelim);
                  directoryDesc.setLineDelim(rowFormatParams.lineDelim);
                  directoryDesc.setCollItemDelim(rowFormatParams.collItemDelim);
                  directoryDesc.setMapKeyDelim(rowFormatParams.mapKeyDelim);
                  directoryDesc.setFieldEscape(rowFormatParams.fieldEscape);
                  directoryDesc.setNullFormat(rowFormatParams.nullFormat);
                  directoryDescIsSet=true;
                  break;
                case HiveParser.TOK_TABLESERIALIZER:
                  ASTNode serdeChild = (ASTNode) child.getChild(0);
                  storageFormat.setSerde(unescapeSQLString(serdeChild.getChild(0).getText()));
                  directoryDesc.setSerName(storageFormat.getSerde());
                  if (serdeChild.getChildCount() > 1) {
                    directoryDesc.setSerdeProps(new HashMap());
                    readProps((ASTNode) serdeChild.getChild(1).getChild(0), directoryDesc.getSerdeProps());
                  }
                  directoryDescIsSet = true;
                  break;
              }
            }
          }
          if (directoryDescIsSet){
            qb.setDirectoryDesc(directoryDesc);
          }
          break;
        }
        default:
          throw new SemanticException(generateErrorMessage(ast,
              "Unknown Token Type " + ast.getToken().getType()));
      }
    }
  }

  /**
   * Checks if a given path is encrypted (valid only for HDFS files)
   * @param path The path to check for encryption
   * @return True if the path is encrypted; False if it is not encrypted
   * @throws HiveException If an error occurs while checking for encryption
   */
  private boolean isPathEncrypted(Path path) throws HiveException {

    try {
      HadoopShims.HdfsEncryptionShim hdfsEncryptionShim = SessionState.get().getHdfsEncryptionShim(path.getFileSystem(conf));
      if (hdfsEncryptionShim != null) {
        if (hdfsEncryptionShim.isPathEncrypted(path)) {
          return true;
        }
      }
    } catch (Exception e) {
        throw new HiveException("Unable to determine if " + path + " is encrypted: " + e, e);
    }

    return false;
  }

  /**
   * Compares to path key encryption strenghts.
   *
   * @param p1 Path to an HDFS file system
   * @param p2 Path to an HDFS file system
   * @return -1 if strength is weak; 0 if is equals; 1 if it is stronger
   * @throws HiveException If an error occurs while comparing key strengths.
   */
  private int comparePathKeyStrength(Path p1, Path p2) throws HiveException {
    HadoopShims.HdfsEncryptionShim hdfsEncryptionShim;

    hdfsEncryptionShim = SessionState.get().getHdfsEncryptionShim();
    if (hdfsEncryptionShim != null) {
      try {
        return hdfsEncryptionShim.comparePathKeyStrength(p1, p2);
      } catch (Exception e) {
        throw new HiveException("Unable to compare key strength for " + p1 + " and " + p2 + " : " + e, e);
      }
    }

    return 0; // Non-encrypted path (or equals strength)
  }

  /**
   * Checks if a given path has read-only access permissions.
   *
   * @param path The path to check for read-only permissions.
   * @return True if the path is read-only; False otherwise.
   * @throws HiveException If an error occurs while checking file permissions.
   */
  private boolean isPathReadOnly(Path path) throws HiveException {
    HiveConf conf = SessionState.get().getConf();
    try {
      FileSystem fs = path.getFileSystem(conf);
      UserGroupInformation ugi = Utils.getUGI();
      FileStatus status = fs.getFileStatus(path);

      // We just check for writing permissions. If it fails with AccessControException, then it
      // means the location may be read-only.
      FileUtils.checkFileAccessWithImpersonation(fs, status, FsAction.WRITE, ugi.getUserName());

      // Path has writing permissions
      return false;
    } catch (AccessControlException e) {
      // An AccessControlException may be caused for other different errors,
      // but we take it as if our path is read-only
      return true;
    } catch (Exception e) {
      throw new HiveException("Unable to determine if " + path + " is read only: " + e, e);
    }
  }

  /**
   * Gets the strongest encrypted table path.
   *
   * @param qb The QB object that contains a list of all table locations.
   * @return The strongest encrypted path. It may return NULL if there are not tables encrypted, or are not HDFS tables.
   * @throws HiveException if an error occurred attempting to compare the encryption strength
   */
  private Path getStrongestEncryptedTablePath(QB qb) throws HiveException {
    List tabAliases = new ArrayList(qb.getTabAliases());
    Path strongestPath = null;

    /* Walk through all found table locations to get the most encrypted table */
    for (String alias : tabAliases) {
      Table tab = qb.getMetaData().getTableForAlias(alias);
      if (tab != null) {
        Path tablePath = tab.getDataLocation();
        if (tablePath != null) {
          if ("hdfs".equalsIgnoreCase(tablePath.toUri().getScheme())) {
            if (isPathEncrypted(tablePath)) {
              if (strongestPath == null) {
                strongestPath = tablePath;
              } else if (comparePathKeyStrength(tablePath, strongestPath) > 0) {
                strongestPath = tablePath;
              }
            }
          }
        }
      }
    }

    return strongestPath;
  }

  /**
   * Gets the staging directory where MR files will be stored temporary.
   * It walks through the QB plan to find the correct location where save temporary files. This
   * temporary location (or staging directory) may be created inside encrypted tables locations for
   * security reasons. If the QB has read-only tables, then the older scratch directory will be used,
   * or a permission error will be thrown if the requested query table is encrypted and the old scratch
   * directory is not.
   *
   * @param qb The QB object that contains a list of all table locations.
   * @return The path to the staging directory.
   * @throws HiveException If an error occurs while identifying the correct staging location.
   */
  private Path getStagingDirectoryPathname(QB qb) throws HiveException {
    Path stagingPath = null, tablePath;

    // Looks for the most encrypted table location
    // It may return null if there are not tables encrypted, or are not part of HDFS
    tablePath = getStrongestEncryptedTablePath(qb);
    if (tablePath != null) {
      // At this point, tablePath is part of HDFS and it is encrypted
      if (isPathReadOnly(tablePath)) {
        Path tmpPath = ctx.getMRTmpPath();
        if (comparePathKeyStrength(tablePath, tmpPath) < 0) {
          throw new HiveException("Read-only encrypted tables cannot be read " +
              "if the scratch directory is not encrypted (or encryption is weak)");
        } else {
          stagingPath = tmpPath;
        }
      }

      if (stagingPath == null) {
        stagingPath = ctx.getMRTmpPath(tablePath.toUri());
      }
    } else {
      stagingPath = ctx.getMRTmpPath();
    }

    return stagingPath;
  }

  private void replaceViewReferenceWithDefinition(QB qb, Table tab,
      String tab_name, String alias) throws SemanticException {

    ASTNode viewTree;
    final ASTNodeOrigin viewOrigin = new ASTNodeOrigin("VIEW", tab.getTableName(),
        tab.getViewExpandedText(), alias, qb.getParseInfo().getSrcForAlias(
            alias));
    try {
      // Reparse text, passing null for context to avoid clobbering
      // the top-level token stream.
      String viewFullyQualifiedName = tab.getCompleteName();
      String viewText = tab.getViewExpandedText();
      TableMask viewMask = new TableMask(this, conf, false);
      viewTree = ParseUtils.parse(viewText, ctx, tab.getCompleteName());
      if (!unparseTranslator.isEnabled() &&
          (viewMask.isEnabled() && analyzeRewrite == null)) {
        viewTree = rewriteASTWithMaskAndFilter(viewMask, viewTree,
            ctx.getViewTokenRewriteStream(viewFullyQualifiedName),
            ctx, db, tabNameToTabObject, ignoredTokens);
      }
      Dispatcher nodeOriginDispatcher = new Dispatcher() {
        @Override
        public Object dispatch(Node nd, java.util.Stack stack,
            Object... nodeOutputs) {
          ((ASTNode) nd).setOrigin(viewOrigin);
          return null;
        }
      };
      GraphWalker nodeOriginTagger = new DefaultGraphWalker(
          nodeOriginDispatcher);
      nodeOriginTagger.startWalking(java.util.Collections
          . singleton(viewTree), null);
    } catch (ParseException e) {
      // A user could encounter this if a stored view definition contains
      // an old SQL construct which has been eliminated in a later Hive
      // version, so we need to provide full debugging info to help
      // with fixing the view definition.
      LOG.error(org.apache.hadoop.util.StringUtils.stringifyException(e));
      StringBuilder sb = new StringBuilder();
      sb.append(e.getMessage());
      ErrorMsg.renderOrigin(sb, viewOrigin);
      throw new SemanticException(sb.toString(), e);
    }
    QBExpr qbexpr = new QBExpr(alias);
    doPhase1QBExpr(viewTree, qbexpr, qb.getId(), alias, true);
    // if skip authorization, skip checking;
    // if it is inside a view, skip checking;
    // if authorization flag is not enabled, skip checking.
    // if HIVE_STATS_COLLECT_SCANCOLS is enabled, check.
    if ((!this.skipAuthorization() && !qb.isInsideView() && HiveConf.getBoolVar(conf,
        HiveConf.ConfVars.HIVE_AUTHORIZATION_ENABLED))
        || HiveConf.getBoolVar(conf, HiveConf.ConfVars.HIVE_STATS_COLLECT_SCANCOLS)) {
      qb.rewriteViewToSubq(alias, tab_name, qbexpr, tab);
    } else {
      qb.rewriteViewToSubq(alias, tab_name, qbexpr, null);
    }
  }

  private boolean isPresent(String[] list, String elem) {
    for (String s : list) {
      if (s.toLowerCase().equals(elem)) {
        return true;
      }
    }

    return false;
  }

  /*
   * This method is invoked for unqualified column references in join conditions.
   * This is passed in the Alias to Operator mapping in the QueryBlock so far.
   * We try to resolve the unqualified column against each of the Operator Row Resolvers.
   * - if the column is present in only one RowResolver, we treat this as a reference to
   *   that Operator.
   * - if the column resolves with more than one RowResolver, we treat it as an Ambiguous
   *   reference.
   * - if the column doesn't resolve with any RowResolver, we treat this as an Invalid
   *   reference.
   */
  @SuppressWarnings("rawtypes")
  private String findAlias(ASTNode columnRef,
      Map aliasToOpInfo) throws SemanticException {
    String colName = unescapeIdentifier(columnRef.getChild(0).getText()
        .toLowerCase());
    String tabAlias = null;
    if ( aliasToOpInfo != null ) {
      for (Map.Entry opEntry : aliasToOpInfo.entrySet()) {
        Operator op = opEntry.getValue();
        RowResolver rr = opParseCtx.get(op).getRowResolver();
        ColumnInfo colInfo = rr.get(null, colName);
        if (colInfo != null) {
          if (tabAlias == null) {
            tabAlias = opEntry.getKey();
          } else {
            throw new SemanticException(
                ErrorMsg.AMBIGUOUS_TABLE_ALIAS.getMsg(columnRef.getChild(0)));
          }
        }
      }
    }
    if ( tabAlias == null ) {
      throw new SemanticException(ErrorMsg.INVALID_TABLE_ALIAS.getMsg(columnRef
          .getChild(0)));
    }
    return tabAlias;
  }

  @SuppressWarnings("nls")
  void parseJoinCondPopulateAlias(QBJoinTree joinTree, ASTNode condn,
      ArrayList leftAliases, ArrayList rightAliases,
      ArrayList fields,
      Map aliasToOpInfo) throws SemanticException {
    // String[] allAliases = joinTree.getAllAliases();
    switch (condn.getToken().getType()) {
    case HiveParser.TOK_TABLE_OR_COL:
      String tableOrCol = unescapeIdentifier(condn.getChild(0).getText()
          .toLowerCase());
      unparseTranslator.addIdentifierTranslation((ASTNode) condn.getChild(0));
      if (isPresent(joinTree.getLeftAliases(), tableOrCol)) {
        if (!leftAliases.contains(tableOrCol)) {
          leftAliases.add(tableOrCol);
        }
      } else if (isPresent(joinTree.getRightAliases(), tableOrCol)) {
        if (!rightAliases.contains(tableOrCol)) {
          rightAliases.add(tableOrCol);
        }
      } else {
        tableOrCol = findAlias(condn, aliasToOpInfo);
        if (isPresent(joinTree.getLeftAliases(), tableOrCol)) {
          if (!leftAliases.contains(tableOrCol)) {
            leftAliases.add(tableOrCol);
          }
        } else  {
          if (!rightAliases.contains(tableOrCol)) {
            rightAliases.add(tableOrCol);
          }
          if (joinTree.getNoSemiJoin() == false) {
            // if this is a semijoin, we need to add the condition
            joinTree.addRHSSemijoinColumns(tableOrCol, condn);
          }
        }
      }
      break;

    case HiveParser.Identifier:
      // it may be a field name, return the identifier and let the caller decide
      // whether it is or not
      if (fields != null) {
        fields
            .add(unescapeIdentifier(condn.getToken().getText().toLowerCase()));
      }
      unparseTranslator.addIdentifierTranslation(condn);
      break;
    case HiveParser.Number:
    case HiveParser.StringLiteral:
    case HiveParser.IntegralLiteral:
    case HiveParser.NumberLiteral:
    case HiveParser.TOK_STRINGLITERALSEQUENCE:
    case HiveParser.TOK_CHARSETLITERAL:
    case HiveParser.KW_TRUE:
    case HiveParser.KW_FALSE:
      break;

    case HiveParser.TOK_FUNCTION:
      // check all the arguments
      for (int i = 1; i < condn.getChildCount(); i++) {
        parseJoinCondPopulateAlias(joinTree, (ASTNode) condn.getChild(i),
            leftAliases, rightAliases, null, aliasToOpInfo);
      }
      break;

    default:
      // This is an operator - so check whether it is unary or binary operator
      if (condn.getChildCount() == 1) {
        parseJoinCondPopulateAlias(joinTree, (ASTNode) condn.getChild(0),
            leftAliases, rightAliases, null, aliasToOpInfo);
      } else if (condn.getChildCount() == 2) {

        ArrayList fields1 = null;
        // if it is a dot operator, remember the field name of the rhs of the
        // left semijoin
        if (joinTree.getNoSemiJoin() == false
            && condn.getToken().getType() == HiveParser.DOT) {
          // get the semijoin rhs table name and field name
          fields1 = new ArrayList();
          int rhssize = rightAliases.size();
          parseJoinCondPopulateAlias(joinTree, (ASTNode) condn.getChild(0),
              leftAliases, rightAliases, null, aliasToOpInfo);
          String rhsAlias = null;

          if (rightAliases.size() > rhssize) { // the new table is rhs table
            rhsAlias = rightAliases.get(rightAliases.size() - 1);
          }

          parseJoinCondPopulateAlias(joinTree, (ASTNode) condn.getChild(1),
              leftAliases, rightAliases, fields1, aliasToOpInfo);
          if (rhsAlias != null && fields1.size() > 0) {
            joinTree.addRHSSemijoinColumns(rhsAlias, condn);
          }
        } else {
          parseJoinCondPopulateAlias(joinTree, (ASTNode) condn.getChild(0),
              leftAliases, rightAliases, null, aliasToOpInfo);
          parseJoinCondPopulateAlias(joinTree, (ASTNode) condn.getChild(1),
              leftAliases, rightAliases, fields1, aliasToOpInfo);
        }
      } else {
        throw new SemanticException(condn.toStringTree() + " encountered with "
            + condn.getChildCount() + " children");
      }
      break;
    }
  }

  private void populateAliases(List leftAliases,
      List rightAliases, ASTNode condn, QBJoinTree joinTree,
      List leftSrc) throws SemanticException {
    if ((leftAliases.size() != 0) && (rightAliases.size() != 0)) {
      joinTree.addPostJoinFilter(condn);
      return;
    }

    if (rightAliases.size() != 0) {
      assert rightAliases.size() == 1;
      joinTree.getExpressions().get(1).add(condn);
    } else if (leftAliases.size() != 0) {
      joinTree.getExpressions().get(0).add(condn);
      for (String s : leftAliases) {
        if (!leftSrc.contains(s)) {
          leftSrc.add(s);
        }
      }
    } else {
      joinTree.addPostJoinFilter(condn);
    }
  }

  /*
   * refactored out of the Equality case of parseJoinCondition
   * so that this can be recursively called on its left tree in the case when
   * only left sources are referenced in a Predicate
   */
  void applyEqualityPredicateToQBJoinTree(QBJoinTree joinTree,
      JoinType type,
      List leftSrc,
      ASTNode joinCond,
      ASTNode leftCondn,
      ASTNode rightCondn,
      List leftCondAl1,
      List leftCondAl2,
      List rightCondAl1,
      List rightCondAl2) throws SemanticException {
    if (leftCondAl1.size() != 0) {
      if ((rightCondAl1.size() != 0)
          || ((rightCondAl1.size() == 0) && (rightCondAl2.size() == 0))) {
        if (type.equals(JoinType.LEFTOUTER) ||
            type.equals(JoinType.FULLOUTER)) {
            joinTree.getFilters().get(0).add(joinCond);
        } else {
          /*
           * If the rhs references table sources and this QBJoinTree has a leftTree;
           * hand it to the leftTree and let it recursively handle it.
           * There are 3 cases of passing a condition down:
           * 1. The leftSide && rightSide don't contains references to the leftTree's rightAlias
           *    => pass the lists down as is.
           * 2. The leftSide contains refs to the leftTree's rightAlias, the rightSide doesn't
           *    => switch the leftCondAl1 and leftConAl2 lists and pass down.
           * 3. The rightSide contains refs to the leftTree's rightAlias, the leftSide doesn't
           *    => switch the rightCondAl1 and rightConAl2 lists and pass down.
           * 4. In case both contain references to the leftTree's rightAlias
           *   => we cannot push the condition down.
           * 5. If either contain references to both left & right
           *    => we cannot push forward.
           */
          if (rightCondAl1.size() != 0) {
            QBJoinTree leftTree = joinTree.getJoinSrc();
            List leftTreeLeftSrc = new ArrayList();
            if (leftTree != null && leftTree.getNoOuterJoin()) {
              String leftTreeRightSource = leftTree.getRightAliases() != null &&
                  leftTree.getRightAliases().length > 0 ?
                  leftTree.getRightAliases()[0] : null;

              boolean leftHasRightReference = false;
              for (String r : leftCondAl1) {
                if (r.equals(leftTreeRightSource)) {
                  leftHasRightReference = true;
                  break;
                }
              }
              boolean rightHasRightReference = false;
              for (String r : rightCondAl1) {
                if (r.equals(leftTreeRightSource)) {
                  rightHasRightReference = true;
                  break;
                }
              }

              boolean pushedDown = false;
              if ( !leftHasRightReference && !rightHasRightReference ) {
                applyEqualityPredicateToQBJoinTree(leftTree, type, leftTreeLeftSrc,
                    joinCond, leftCondn, rightCondn,
                    leftCondAl1, leftCondAl2,
                    rightCondAl1, rightCondAl2);
                pushedDown = true;
              } else if ( !leftHasRightReference && rightHasRightReference && rightCondAl1.size() == 1 ) {
                applyEqualityPredicateToQBJoinTree(leftTree, type, leftTreeLeftSrc,
                    joinCond, leftCondn, rightCondn,
                    leftCondAl1, leftCondAl2,
                    rightCondAl2, rightCondAl1);
                pushedDown = true;
              } else if (leftHasRightReference && !rightHasRightReference && leftCondAl1.size() == 1 ) {
                applyEqualityPredicateToQBJoinTree(leftTree, type, leftTreeLeftSrc,
                    joinCond, leftCondn, rightCondn,
                    leftCondAl2, leftCondAl1,
                    rightCondAl1, rightCondAl2);
                pushedDown = true;
              }

              if (leftTreeLeftSrc.size() == 1) {
                leftTree.setLeftAlias(leftTreeLeftSrc.get(0));
              }
              if ( pushedDown) {
                return;
              }
            } // leftTree != null
          }
          joinTree.getFiltersForPushing().get(0).add(joinCond);
        }
      } else if (rightCondAl2.size() != 0) {
        populateAliases(leftCondAl1, leftCondAl2, leftCondn, joinTree,
            leftSrc);
        populateAliases(rightCondAl1, rightCondAl2, rightCondn, joinTree,
            leftSrc);
        boolean nullsafe = joinCond.getToken().getType() == HiveParser.EQUAL_NS;
        joinTree.getNullSafes().add(nullsafe);
      }
    } else if (leftCondAl2.size() != 0) {
      if ((rightCondAl2.size() != 0)
          || ((rightCondAl1.size() == 0) && (rightCondAl2.size() == 0))) {
        if (type.equals(JoinType.RIGHTOUTER)
            || type.equals(JoinType.FULLOUTER)) {
            joinTree.getFilters().get(1).add(joinCond);
        } else {
          joinTree.getFiltersForPushing().get(1).add(joinCond);
        }
      } else if (rightCondAl1.size() != 0) {
        populateAliases(leftCondAl1, leftCondAl2, leftCondn, joinTree,
            leftSrc);
        populateAliases(rightCondAl1, rightCondAl2, rightCondn, joinTree,
            leftSrc);
        boolean nullsafe = joinCond.getToken().getType() == HiveParser.EQUAL_NS;
        joinTree.getNullSafes().add(nullsafe);
      }
    } else if (rightCondAl1.size() != 0) {
      if (type.equals(JoinType.LEFTOUTER)
          || type.equals(JoinType.FULLOUTER)) {
          joinTree.getFilters().get(0).add(joinCond);
      } else {
        joinTree.getFiltersForPushing().get(0).add(joinCond);
      }
    } else {
      if (type.equals(JoinType.RIGHTOUTER)
          || type.equals(JoinType.FULLOUTER)) {
          joinTree.getFilters().get(1).add(joinCond);
      } else if (type.equals(JoinType.LEFTSEMI)) {
        joinTree.getExpressions().get(0).add(leftCondn);
        joinTree.getExpressions().get(1).add(rightCondn);
        boolean nullsafe = joinCond.getToken().getType() == HiveParser.EQUAL_NS;
        joinTree.getNullSafes().add(nullsafe);
        joinTree.getFiltersForPushing().get(1).add(joinCond);
      } else {
        joinTree.getFiltersForPushing().get(1).add(joinCond);
      }
    }

  }

  @SuppressWarnings("rawtypes")
  private void parseJoinCondition(QBJoinTree joinTree, ASTNode joinCond, List leftSrc,
      Map aliasToOpInfo)
      throws SemanticException {
    if (joinCond == null) {
      return;
    }
    JoinCond cond = joinTree.getJoinCond()[0];

    JoinType type = cond.getJoinType();
    parseJoinCondition(joinTree, joinCond, leftSrc, type, aliasToOpInfo);

    List> filters = joinTree.getFilters();
    if (type == JoinType.LEFTOUTER || type == JoinType.FULLOUTER) {
      joinTree.addFilterMapping(cond.getLeft(), cond.getRight(), filters.get(0).size());
    }
    if (type == JoinType.RIGHTOUTER || type == JoinType.FULLOUTER) {
      joinTree.addFilterMapping(cond.getRight(), cond.getLeft(), filters.get(1).size());
    }
  }

  /**
   * Parse the join condition. If the condition is a join condition, throw an
   * error if it is not an equality. Otherwise, break it into left and right
   * expressions and store in the join tree. If the condition is a join filter,
   * add it to the filter list of join tree. The join condition can contains
   * conditions on both the left and tree trees and filters on either.
   * Currently, we only support equi-joins, so we throw an error if the
   * condition involves both subtrees and is not a equality. Also, we only
   * support AND i.e ORs are not supported currently as their semantics are not
   * very clear, may lead to data explosion and there is no usecase.
   *
   * @param joinTree
   *          jointree to be populated
   * @param joinCond
   *          join condition
   * @param leftSrc
   *          left sources
   * @throws SemanticException
   */
  @SuppressWarnings("rawtypes")
  private void parseJoinCondition(QBJoinTree joinTree, ASTNode joinCond,
      List leftSrc, JoinType type,
      Map aliasToOpInfo) throws SemanticException {
    if (joinCond == null) {
      return;
    }

    switch (joinCond.getToken().getType()) {
    case HiveParser.KW_OR:
      joinTree.addPostJoinFilter(joinCond);
      break;

    case HiveParser.KW_AND:
      parseJoinCondition(joinTree, (ASTNode) joinCond.getChild(0), leftSrc, type, aliasToOpInfo);
      parseJoinCondition(joinTree, (ASTNode) joinCond.getChild(1), leftSrc, type, aliasToOpInfo);
      break;

    case HiveParser.EQUAL_NS:
    case HiveParser.EQUAL:
      ASTNode leftCondn = (ASTNode) joinCond.getChild(0);
      ArrayList leftCondAl1 = new ArrayList();
      ArrayList leftCondAl2 = new ArrayList();
      parseJoinCondPopulateAlias(joinTree, leftCondn, leftCondAl1, leftCondAl2,
          null, aliasToOpInfo);

      ASTNode rightCondn = (ASTNode) joinCond.getChild(1);
      ArrayList rightCondAl1 = new ArrayList();
      ArrayList rightCondAl2 = new ArrayList();
      parseJoinCondPopulateAlias(joinTree, rightCondn, rightCondAl1,
          rightCondAl2, null, aliasToOpInfo);

      // is it a filter or a join condition
      // if it is filter see if it can be pushed above the join
      // filter cannot be pushed if
      // * join is full outer or
      // * join is left outer and filter is on left alias or
      // * join is right outer and filter is on right alias
      if (((leftCondAl1.size() != 0) && (leftCondAl2.size() != 0))
          || ((rightCondAl1.size() != 0) && (rightCondAl2.size() != 0))) {
        joinTree.addPostJoinFilter(joinCond);
      } else {
        applyEqualityPredicateToQBJoinTree(joinTree, type, leftSrc,
            joinCond, leftCondn, rightCondn,
            leftCondAl1, leftCondAl2,
            rightCondAl1, rightCondAl2);
      }
      break;

    default:
      boolean isFunction = (joinCond.getType() == HiveParser.TOK_FUNCTION);

      // Create all children
      int childrenBegin = (isFunction ? 1 : 0);
      ArrayList> leftAlias = new ArrayList>(
          joinCond.getChildCount() - childrenBegin);
      ArrayList> rightAlias = new ArrayList>(
          joinCond.getChildCount() - childrenBegin);
      for (int ci = 0; ci < joinCond.getChildCount() - childrenBegin; ci++) {
        ArrayList left = new ArrayList();
        ArrayList right = new ArrayList();
        leftAlias.add(left);
        rightAlias.add(right);
      }

      for (int ci = childrenBegin; ci < joinCond.getChildCount(); ci++) {
        parseJoinCondPopulateAlias(joinTree, (ASTNode) joinCond.getChild(ci),
            leftAlias.get(ci - childrenBegin), rightAlias.get(ci
                - childrenBegin), null, aliasToOpInfo);
      }

      boolean leftAliasNull = true;
      for (ArrayList left : leftAlias) {
        if (left.size() != 0) {
          leftAliasNull = false;
          break;
        }
      }

      boolean rightAliasNull = true;
      for (ArrayList right : rightAlias) {
        if (right.size() != 0) {
          rightAliasNull = false;
          break;
        }
      }

      if (!leftAliasNull && !rightAliasNull) {
        joinTree.addPostJoinFilter(joinCond);
      } else {
        if (!leftAliasNull) {
          if (type.equals(JoinType.LEFTOUTER)
              || type.equals(JoinType.FULLOUTER)) {
              joinTree.getFilters().get(0).add(joinCond);
          } else {
            joinTree.getFiltersForPushing().get(0).add(joinCond);
          }
        } else {
          if (type.equals(JoinType.RIGHTOUTER)
              || type.equals(JoinType.FULLOUTER)) {
              joinTree.getFilters().get(1).add(joinCond);
          } else {
            joinTree.getFiltersForPushing().get(1).add(joinCond);
          }
        }
      }

      break;
    }
  }

  @SuppressWarnings("rawtypes")
  private void extractJoinCondsFromWhereClause(QBJoinTree joinTree, QB qb, String dest, ASTNode predicate,
      Map aliasToOpInfo) throws SemanticException {

    switch (predicate.getType()) {
    case HiveParser.KW_AND:
      extractJoinCondsFromWhereClause(joinTree, qb, dest,
          (ASTNode) predicate.getChild(0), aliasToOpInfo);
      extractJoinCondsFromWhereClause(joinTree, qb, dest,
          (ASTNode) predicate.getChild(1), aliasToOpInfo);
      break;
    case HiveParser.EQUAL_NS:
    case HiveParser.EQUAL:

      ASTNode leftCondn = (ASTNode) predicate.getChild(0);
      ArrayList leftCondAl1 = new ArrayList();
      ArrayList leftCondAl2 = new ArrayList();
      try {
        parseJoinCondPopulateAlias(joinTree, leftCondn, leftCondAl1, leftCondAl2,
          null, aliasToOpInfo);
      } catch(SemanticException se) {
        // suppress here; if it is a real issue will get caught in where clause handling.
        return;
      }

      ASTNode rightCondn = (ASTNode) predicate.getChild(1);
      ArrayList rightCondAl1 = new ArrayList();
      ArrayList rightCondAl2 = new ArrayList();
      try {
        parseJoinCondPopulateAlias(joinTree, rightCondn, rightCondAl1,
            rightCondAl2, null, aliasToOpInfo);
      } catch(SemanticException se) {
        // suppress here; if it is a real issue will get caught in where clause handling.
        return;
      }

      if (((leftCondAl1.size() != 0) && (leftCondAl2.size() != 0))
          || ((rightCondAl1.size() != 0) && (rightCondAl2.size() != 0))) {
        // this is not a join condition.
        return;
      }

      if (((leftCondAl1.size() == 0) && (leftCondAl2.size() == 0))
          || ((rightCondAl1.size() == 0) && (rightCondAl2.size() == 0))) {
        // this is not a join condition. Will get handled by predicate pushdown.
        return;
      }

      List leftSrc = new ArrayList();
      JoinCond cond = joinTree.getJoinCond()[0];
      JoinType type = cond.getJoinType();
      applyEqualityPredicateToQBJoinTree(joinTree, type, leftSrc,
          predicate, leftCondn, rightCondn,
          leftCondAl1, leftCondAl2,
          rightCondAl1, rightCondAl2);
      if (leftSrc.size() == 1) {
        joinTree.setLeftAlias(leftSrc.get(0));
      }

      // todo: hold onto this predicate, so that we don't add it to the Filter Operator.

      break;
    default:
      return;
    }
  }

  @SuppressWarnings("nls")
  public  Operator putOpInsertMap(Operator op,
      RowResolver rr) {
    OpParseContext ctx = new OpParseContext(rr);
    opParseCtx.put(op, ctx);
    op.augmentPlan();
    return op;
  }

  @SuppressWarnings("nls")
  private Operator genHavingPlan(String dest, QB qb, Operator input,
      Map aliasToOpInfo)
      throws SemanticException {

    ASTNode havingExpr = qb.getParseInfo().getHavingForClause(dest);

    OpParseContext inputCtx = opParseCtx.get(input);
    RowResolver inputRR = inputCtx.getRowResolver();
    Map exprToColumnAlias = qb.getParseInfo().getAllExprToColumnAlias();
    for (ASTNode astNode : exprToColumnAlias.keySet()) {
      if (inputRR.getExpression(astNode) != null) {
        inputRR.put("", exprToColumnAlias.get(astNode), inputRR.getExpression(astNode));
      }
    }
    ASTNode condn = (ASTNode) havingExpr.getChild(0);

    if (!isCBOExecuted() && !qb.getParseInfo().getDestToGroupBy().isEmpty()) {
      // If CBO did not optimize the query, we might need to replace grouping function
      final String destClauseName = qb.getParseInfo().getClauseNames().iterator().next();
      final boolean cubeRollupGrpSetPresent = (!qb.getParseInfo().getDestRollups().isEmpty()
              || !qb.getParseInfo().getDestGroupingSets().isEmpty()
              || !qb.getParseInfo().getDestCubes().isEmpty());
      // Special handling of grouping function
      condn = rewriteGroupingFunctionAST(getGroupByForClause(qb.getParseInfo(), destClauseName), condn,
          !cubeRollupGrpSetPresent);
    }

    /*
     * Now a having clause can contain a SubQuery predicate;
     * so we invoke genFilterPlan to handle SubQuery algebraic transformation,
     * just as is done for SubQuery predicates appearing in the Where Clause.
     */
    Operator output = genFilterPlan(condn, qb, input, aliasToOpInfo, true, false);
    output = putOpInsertMap(output, inputRR);
    return output;
  }

  protected static ASTNode rewriteGroupingFunctionAST(final List grpByAstExprs, ASTNode targetNode,
          final boolean noneSet) throws SemanticException {
    final MutableBoolean visited = new MutableBoolean(false);
    final MutableBoolean found = new MutableBoolean(false);

    TreeVisitorAction action = new TreeVisitorAction() {

      @Override
      public Object pre(Object t) {
        return t;
      }

      @Override
      public Object post(Object t) {
        ASTNode root = (ASTNode) t;
        if (root.getType() == HiveParser.TOK_FUNCTION && root.getChildCount() == 2) {
          ASTNode func = (ASTNode) ParseDriver.adaptor.getChild(root, 0);
          if (func.getText().equals("grouping")) {
            ASTNode c = (ASTNode) ParseDriver.adaptor.getChild(root, 1);
            visited.setValue(true);
            for (int i = 0; i < grpByAstExprs.size(); i++) {
              ASTNode grpByExpr = grpByAstExprs.get(i);
              if (grpByExpr.toStringTree().equals(c.toStringTree())) {
                ASTNode child1;
                if (noneSet) {
                  // Query does not contain CUBE, ROLLUP, or GROUPING SETS, and thus,
                  // grouping should return 0
                  child1 = (ASTNode) ParseDriver.adaptor.create(HiveParser.IntegralLiteral,
                        String.valueOf(0));
                } else {
                  // We refer to grouping_id column
                  child1 = (ASTNode) ParseDriver.adaptor.create(
                          HiveParser.TOK_TABLE_OR_COL, "TOK_TABLE_OR_COL");
                  ParseDriver.adaptor.addChild(child1, ParseDriver.adaptor.create(
                          HiveParser.Identifier, VirtualColumn.GROUPINGID.getName()));
                }
                ASTNode child2 = (ASTNode) ParseDriver.adaptor.create(HiveParser.IntegralLiteral,
                        String.valueOf(IntMath.mod(-i-1, grpByAstExprs.size())));
                root.setChild(1, child1);
                root.addChild(child2);
                found.setValue(true);
                break;
              }
            }
          }
        }
        return t;
      }
    };
    ASTNode newTargetNode = (ASTNode) new TreeVisitor(ParseDriver.adaptor).visit(targetNode, action);
    if (visited.booleanValue() && !found.booleanValue()) {
      throw new SemanticException(ErrorMsg.HIVE_GROUPING_FUNCTION_EXPR_NOT_IN_GROUPBY.getMsg());
    }
    return newTargetNode;
  }

  private Operator genPlanForSubQueryPredicate(
      QB qbSQ,
      ISubQueryJoinInfo subQueryPredicate) throws SemanticException {
    qbSQ.setSubQueryDef(subQueryPredicate.getSubQuery());
    Phase1Ctx ctx_1 = initPhase1Ctx();
    doPhase1(subQueryPredicate.getSubQueryAST(), qbSQ, ctx_1, null);
    getMetaData(qbSQ);
    Operator op = genPlan(qbSQ);
    return op;
  }

  @SuppressWarnings("nls")
  private Operator genFilterPlan(ASTNode searchCond, QB qb, Operator input,
      Map aliasToOpInfo,
      boolean forHavingClause, boolean forGroupByClause)
      throws SemanticException {

    OpParseContext inputCtx = opParseCtx.get(input);
    RowResolver inputRR = inputCtx.getRowResolver();

    /*
     * Handling of SubQuery Expressions:
     * if "Where clause contains no SubQuery expressions" then
     *   -->[true] ===CONTINUE_FILTER_PROCESSING===
     * else
     *   -->[false] "extract SubQuery expressions\n from Where clause"
     *   if "this is a nested SubQuery or \nthere are more than 1 SubQuery expressions" then
     *     -->[yes] "throw Unsupported Error"
     *   else
     *     --> "Rewrite Search condition to \nremove SubQuery predicate"
     *      --> "build QBSubQuery"
     *        --> "extract correlated predicates \nfrom Where Clause"
     *        --> "add correlated Items to \nSelect List and Group By"
     *        --> "construct Join Predicate \nfrom correlation predicates"
     *     --> "Generate Plan for\n modified SubQuery"
     *     --> "Build the Join Condition\n for Parent Query to SubQuery join"
     *     --> "Build the QBJoinTree from the Join condition"
     *     --> "Update Parent Query Filter\n with any Post Join conditions"
     *     --> ===CONTINUE_FILTER_PROCESSING===
     *   endif
     * endif
     *
     * Support for Sub Queries in Having Clause:
     * - By and large this works the same way as SubQueries in the Where Clause.
     * - The one addum is the handling of aggregation expressions from the Outer Query
     *   appearing in correlation clauses.
     *   - So such correlating predicates are allowed:
     *        min(OuterQuert.x) = SubQuery.y
     *   - this requires special handling when converting to joins. See QBSubQuery.rewrite
     *     method method for detailed comments.
     */
    List subQueriesInOriginalTree = SubQueryUtils.findSubQueries(searchCond);

    if ( subQueriesInOriginalTree.size() > 0 ) {

      /*
       * Restriction.9.m :: disallow nested SubQuery expressions.
       */
      if (qb.getSubQueryPredicateDef() != null  ) {
        throw new SemanticException(ErrorMsg.UNSUPPORTED_SUBQUERY_EXPRESSION.getMsg(
            subQueriesInOriginalTree.get(0), "Nested SubQuery expressions are not supported."));
      }

      /*
       * Restriction.8.m :: We allow only 1 SubQuery expression per Query.
       */
      if (subQueriesInOriginalTree.size() > 1 ) {

        throw new SemanticException(ErrorMsg.UNSUPPORTED_SUBQUERY_EXPRESSION.getMsg(
            subQueriesInOriginalTree.get(1), "Only 1 SubQuery expression is supported."));
      }

      /*
       * Clone the Search AST; apply all rewrites on the clone.
       */
      ASTNode clonedSearchCond = (ASTNode) SubQueryUtils.adaptor.dupTree(searchCond);
      List subQueries = SubQueryUtils.findSubQueries(clonedSearchCond);

      for(int i=0; i < subQueries.size(); i++) {
        ASTNode subQueryAST = subQueries.get(i);
        ASTNode originalSubQueryAST = subQueriesInOriginalTree.get(i);

        int sqIdx = qb.incrNumSubQueryPredicates();
        clonedSearchCond = SubQueryUtils.rewriteParentQueryWhere(clonedSearchCond, subQueryAST);

        QBSubQuery subQuery = SubQueryUtils.buildSubQuery(qb.getId(),
            sqIdx, subQueryAST, originalSubQueryAST, ctx);

        if ( !forHavingClause ) {
          qb.setWhereClauseSubQueryPredicate(subQuery);
        } else {
          qb.setHavingClauseSubQueryPredicate(subQuery);
        }
        String havingInputAlias = null;

        if ( forHavingClause ) {
          havingInputAlias = "gby_sq" + sqIdx;
          aliasToOpInfo.put(havingInputAlias, input);
        }

        subQuery.validateAndRewriteAST(inputRR, forHavingClause, havingInputAlias, aliasToOpInfo.keySet());

        QB qbSQ = new QB(subQuery.getOuterQueryId(), subQuery.getAlias(), true);
        Operator sqPlanTopOp = genPlanForSubQueryPredicate(qbSQ, subQuery);
        aliasToOpInfo.put(subQuery.getAlias(), sqPlanTopOp);
        RowResolver sqRR = opParseCtx.get(sqPlanTopOp).getRowResolver();

        /*
         * Check.5.h :: For In and Not In the SubQuery must implicitly or
         * explicitly only contain one select item.
         */
        if ( subQuery.getOperator().getType() != SubQueryType.EXISTS &&
            subQuery.getOperator().getType() != SubQueryType.NOT_EXISTS &&
            sqRR.getColumnInfos().size() -
               subQuery.getNumOfCorrelationExprsAddedToSQSelect() > 1 ) {
          throw new SemanticException(ErrorMsg.INVALID_SUBQUERY_EXPRESSION.getMsg(
              subQueryAST, "SubQuery can contain only 1 item in Select List."));
        }

        /*
         * If this is a Not In SubQuery Predicate then Join in the Null Check SubQuery.
         * See QBSubQuery.NotInCheck for details on why and how this is constructed.
         */
        if ( subQuery.getNotInCheck() != null ) {
          QBSubQuery.NotInCheck notInCheck = subQuery.getNotInCheck();
          notInCheck.setSQRR(sqRR);
          QB qbSQ_nic = new QB(subQuery.getOuterQueryId(), notInCheck.getAlias(), true);
          Operator sqnicPlanTopOp = genPlanForSubQueryPredicate(qbSQ_nic, notInCheck);
          aliasToOpInfo.put(notInCheck.getAlias(), sqnicPlanTopOp);
          QBJoinTree joinTree_nic = genSQJoinTree(qb, notInCheck,
              input,
              aliasToOpInfo);
          pushJoinFilters(qb, joinTree_nic, aliasToOpInfo, false);
          input = genJoinOperator(qbSQ_nic, joinTree_nic, aliasToOpInfo, input);
          inputRR = opParseCtx.get(input).getRowResolver();
          if ( forHavingClause ) {
            aliasToOpInfo.put(havingInputAlias, input);
          }
        }

        /*
         * Gen Join between outer Operator and SQ op
         */
        subQuery.buildJoinCondition(inputRR, sqRR, forHavingClause, havingInputAlias);
        QBJoinTree joinTree = genSQJoinTree(qb, subQuery,
            input,
            aliasToOpInfo);
        /*
         * push filters only for this QBJoinTree. Child QBJoinTrees have already been handled.
         */
        pushJoinFilters(qb, joinTree, aliasToOpInfo, false);
        input = genJoinOperator(qbSQ, joinTree, aliasToOpInfo, input);
        searchCond = subQuery.updateOuterQueryFilter(clonedSearchCond);
      }
    }

    return genFilterPlan(qb, searchCond, input, forHavingClause || forGroupByClause);
  }

  /**
   * create a filter plan. The condition and the inputs are specified.
   *
   * @param qb
   *          current query block
   * @param condn
   *          The condition to be resolved
   * @param input
   *          the input operator
   */
  @SuppressWarnings("nls")
  private Operator genFilterPlan(QB qb, ASTNode condn, Operator input, boolean useCaching)
      throws SemanticException {

    OpParseContext inputCtx = opParseCtx.get(input);
    RowResolver inputRR = inputCtx.getRowResolver();

    ExprNodeDesc filterCond = genExprNodeDesc(condn, inputRR, useCaching, isCBOExecuted());
    if (filterCond instanceof ExprNodeConstantDesc) {
      ExprNodeConstantDesc c = (ExprNodeConstantDesc) filterCond;
      if (Boolean.TRUE.equals(c.getValue())) {
        // If filter condition is TRUE, we ignore it
        return input;
      }
      if (ExprNodeDescUtils.isNullConstant(c)) {
        // If filter condition is NULL, transform to FALSE
        filterCond = new ExprNodeConstantDesc(TypeInfoFactory.booleanTypeInfo, false);
      }
    }

    Operator output = putOpInsertMap(OperatorFactory.getAndMakeChild(
        new FilterDesc(filterCond, false), new RowSchema(
            inputRR.getColumnInfos()), input), inputRR);

    if (LOG.isDebugEnabled()) {
      LOG.debug("Created Filter Plan for " + qb.getId() + " row schema: "
          + inputRR.toString());
    }
    return output;
  }

  /*
   * for inner joins push a 'is not null predicate' to the join sources for
   * every non nullSafe predicate.
   */
  private Operator genNotNullFilterForJoinSourcePlan(QB qb, Operator input,
      QBJoinTree joinTree, ExprNodeDesc[] joinKeys) throws SemanticException {

    if (qb == null || joinTree == null) {
      return input;
    }

    if (!joinTree.getNoOuterJoin()) {
      return input;
    }

    if (joinKeys == null || joinKeys.length == 0) {
      return input;
    }
    Map hashes = new HashMap();
    if (input instanceof FilterOperator) {
      ExprNodeDescUtils.getExprNodeColumnDesc(Arrays.asList(((FilterDesc)input.getConf()).getPredicate()), hashes);
    }
    ExprNodeDesc filterPred = null;
    List nullSafes = joinTree.getNullSafes();
    for (int i = 0; i < joinKeys.length; i++) {
      if (nullSafes.get(i) || (joinKeys[i] instanceof ExprNodeColumnDesc &&
         ((ExprNodeColumnDesc)joinKeys[i]).getIsPartitionColOrVirtualCol())) {
        // no need to generate is not null predicate for partitioning or
        // virtual column, since those columns can never be null.
        continue;
      }
      if(null != hashes.get(joinKeys[i].hashCode())) {
        // there is already a predicate on this src.
        continue;
      }
      List args = new ArrayList();
      args.add(joinKeys[i]);
      ExprNodeDesc nextExpr = ExprNodeGenericFuncDesc.newInstance(
          FunctionRegistry.getFunctionInfo("isnotnull").getGenericUDF(), args);
      filterPred = filterPred == null ? nextExpr : ExprNodeDescUtils
          .mergePredicates(filterPred, nextExpr);
    }

    if (filterPred == null) {
      return input;
    }

    OpParseContext inputCtx = opParseCtx.get(input);
    RowResolver inputRR = inputCtx.getRowResolver();

    if (input instanceof FilterOperator) {
      FilterOperator f = (FilterOperator) input;
      List preds = new ArrayList();
      preds.add(f.getConf().getPredicate());
      preds.add(filterPred);
      f.getConf().setPredicate(ExprNodeDescUtils.mergePredicates(preds));

      return input;
    }

    FilterDesc filterDesc = new FilterDesc(filterPred, false);
    filterDesc.setGenerated(true);
    Operator output = putOpInsertMap(OperatorFactory.getAndMakeChild(filterDesc,
        new RowSchema(inputRR.getColumnInfos()), input), inputRR);

    if (LOG.isDebugEnabled()) {
      LOG.debug("Created Filter Plan for " + qb.getId() + " row schema: "
          + inputRR.toString());
    }
    return output;
  }

  @SuppressWarnings("nls")
  // TODO: make aliases unique, otherwise needless rewriting takes place
  Integer genColListRegex(String colRegex, String tabAlias, ASTNode sel,
    ArrayList col_list, HashSet excludeCols, RowResolver input,
    RowResolver colSrcRR, Integer pos, RowResolver output, List aliases,
    boolean ensureUniqueCols) throws SemanticException {

    if (colSrcRR == null) {
      colSrcRR = input;
    }
    // The table alias should exist
    if (tabAlias != null && !colSrcRR.hasTableAlias(tabAlias)) {
      throw new SemanticException(ErrorMsg.INVALID_TABLE_ALIAS.getMsg(sel));
    }

    // TODO: Have to put in the support for AS clause
    Pattern regex = null;
    try {
      regex = Pattern.compile(colRegex, Pattern.CASE_INSENSITIVE);
    } catch (PatternSyntaxException e) {
      throw new SemanticException(ErrorMsg.INVALID_COLUMN.getMsg(sel, e
          .getMessage()));
    }

    StringBuilder replacementText = new StringBuilder();
    int matched = 0;
    // add empty string to the list of aliases. Some operators (ex. GroupBy) add
    // ColumnInfos for table alias "".
    if (!aliases.contains("")) {
      aliases.add("");
    }
    /*
     * track the input ColumnInfos that are added to the output.
     * if a columnInfo has multiple mappings; then add the column only once,
     * but carry the mappings forward.
     */
    Map inputColsProcessed = new HashMap();
    // For expr "*", aliases should be iterated in the order they are specified
    // in the query.

    if (colSrcRR.getNamedJoinInfo() != null) {
      // We got using() clause in previous join. Need to generate select list as
      // per standard. For * we will have joining columns first non-repeated
      // followed by other columns.
      HashMap leftMap = colSrcRR.getFieldMap(colSrcRR.getNamedJoinInfo().getAliases().get(0));
      HashMap rightMap = colSrcRR.getFieldMap(colSrcRR.getNamedJoinInfo().getAliases().get(1));
      HashMap chosenMap = null;
      if (colSrcRR.getNamedJoinInfo().getHiveJoinType() != JoinType.RIGHTOUTER) {
        chosenMap = leftMap;
      } else {
        chosenMap = rightMap;
      }
      // first get the columns in named columns
      for (String columnName : colSrcRR.getNamedJoinInfo().getNamedColumns()) {
        for (Map.Entry entry : chosenMap.entrySet()) {
          ColumnInfo colInfo = entry.getValue();
          if (!columnName.equals(colInfo.getAlias())) {
            continue;
          }
          String name = colInfo.getInternalName();
          String[] tmp = colSrcRR.reverseLookup(name);

          // Skip the colinfos which are not for this particular alias
          if (tabAlias != null && !tmp[0].equalsIgnoreCase(tabAlias)) {
            continue;
          }

          if (colInfo.getIsVirtualCol() && colInfo.isHiddenVirtualCol()) {
            continue;
          }
          ColumnInfo oColInfo = inputColsProcessed.get(colInfo);
          if (oColInfo == null) {
            ExprNodeColumnDesc expr = new ExprNodeColumnDesc(colInfo.getType(), name,
                colInfo.getTabAlias(), colInfo.getIsVirtualCol(), colInfo.isSkewedCol());
            col_list.add(expr);
            oColInfo = new ColumnInfo(getColumnInternalName(pos), colInfo.getType(),
                colInfo.getTabAlias(), colInfo.getIsVirtualCol(), colInfo.isHiddenVirtualCol());
            inputColsProcessed.put(colInfo, oColInfo);
          }
          if (ensureUniqueCols) {
            if (!output.putWithCheck(tmp[0], tmp[1], null, oColInfo)) {
              throw new CalciteSemanticException("Cannot add column to RR: " + tmp[0] + "."
                  + tmp[1] + " => " + oColInfo + " due to duplication, see previous warnings",
                  UnsupportedFeature.Duplicates_in_RR);
            }
          } else {
            output.put(tmp[0], tmp[1], oColInfo);
          }
          pos = Integer.valueOf(pos.intValue() + 1);
          matched++;

          if (unparseTranslator.isEnabled() || tableMask.isEnabled()) {
            if (replacementText.length() > 0) {
              replacementText.append(", ");
            }
            replacementText.append(HiveUtils.unparseIdentifier(tmp[0], conf));
            replacementText.append(".");
            replacementText.append(HiveUtils.unparseIdentifier(tmp[1], conf));
          }
        }
      }
    }
    for (String alias : aliases) {
      HashMap fMap = colSrcRR.getFieldMap(alias);
      if (fMap == null) {
        continue;
      }
      // For the tab.* case, add all the columns to the fieldList
      // from the input schema
      for (Map.Entry entry : fMap.entrySet()) {
        ColumnInfo colInfo = entry.getValue();
        if (colSrcRR.getNamedJoinInfo() != null && colSrcRR.getNamedJoinInfo().getNamedColumns().contains(colInfo.getAlias())) {
          // we already added this column in select list.
          continue;
        }
        if (excludeCols != null && excludeCols.contains(colInfo)) {
          continue; // This was added during plan generation.
        }
        // First, look up the column from the source against which * is to be
        // resolved.
        // We'd later translated this into the column from proper input, if
        // it's valid.
        // TODO: excludeCols may be possible to remove using the same
        // technique.
        String name = colInfo.getInternalName();
        String[] tmp = colSrcRR.reverseLookup(name);

        // Skip the colinfos which are not for this particular alias
        if (tabAlias != null && !tmp[0].equalsIgnoreCase(tabAlias)) {
          continue;
        }

        if (colInfo.getIsVirtualCol() && colInfo.isHiddenVirtualCol()) {
          continue;
        }

        // Not matching the regex?
        if (!regex.matcher(tmp[1]).matches()) {
          continue;
        }

        // If input (GBY) is different than the source of columns, find the
        // same column in input.
        // TODO: This is fraught with peril.
        if (input != colSrcRR) {
          colInfo = input.get(tabAlias, tmp[1]);
          if (colInfo == null) {
            LOG.error("Cannot find colInfo for " + tabAlias + "." + tmp[1] + ", derived from ["
                + colSrcRR + "], in [" + input + "]");
            throw new SemanticException(ErrorMsg.NON_KEY_EXPR_IN_GROUPBY, tmp[1]);
          }
          String oldCol = null;
          if (LOG.isDebugEnabled()) {
            oldCol = name + " => " + (tmp == null ? "null" : (tmp[0] + "." + tmp[1]));
          }
          name = colInfo.getInternalName();
          tmp = input.reverseLookup(name);
          if (LOG.isDebugEnabled()) {
            String newCol = name + " => " + (tmp == null ? "null" : (tmp[0] + "." + tmp[1]));
            LOG.debug("Translated [" + oldCol + "] to [" + newCol + "]");
          }
        }

        ColumnInfo oColInfo = inputColsProcessed.get(colInfo);
        if (oColInfo == null) {
          ExprNodeColumnDesc expr = new ExprNodeColumnDesc(colInfo.getType(), name,
              colInfo.getTabAlias(), colInfo.getIsVirtualCol(), colInfo.isSkewedCol());
          col_list.add(expr);
          oColInfo = new ColumnInfo(getColumnInternalName(pos), colInfo.getType(),
              colInfo.getTabAlias(), colInfo.getIsVirtualCol(), colInfo.isHiddenVirtualCol());
          inputColsProcessed.put(colInfo, oColInfo);
        }
        if (ensureUniqueCols) {
          if (!output.putWithCheck(tmp[0], tmp[1], null, oColInfo)) {
            throw new CalciteSemanticException("Cannot add column to RR: " + tmp[0] + "." + tmp[1]
                + " => " + oColInfo + " due to duplication, see previous warnings",
                UnsupportedFeature.Duplicates_in_RR);
          }
        } else {
          output.put(tmp[0], tmp[1], oColInfo);
        }
        pos = Integer.valueOf(pos.intValue() + 1);
        matched++;

        if (unparseTranslator.isEnabled() || tableMask.isEnabled()) {
          if (replacementText.length() > 0) {
            replacementText.append(", ");
          }
          replacementText.append(HiveUtils.unparseIdentifier(tmp[0], conf));
          replacementText.append(".");
          replacementText.append(HiveUtils.unparseIdentifier(tmp[1], conf));
        }
      }
    }

    if (matched == 0) {
      throw new SemanticException(ErrorMsg.INVALID_COLUMN.getMsg(sel));
    }

    if (unparseTranslator.isEnabled()) {
      unparseTranslator.addTranslation(sel, replacementText.toString());
    } else if (tableMask.isEnabled()) {
      tableMask.addTranslation(sel, replacementText.toString());
    }
    return pos;
  }

  public static String getColumnInternalName(int pos) {
    return HiveConf.getColumnInternalName(pos);
  }

  private String getScriptProgName(String cmd) {
    int end = cmd.indexOf(" ");
    return (end == -1) ? cmd : cmd.substring(0, end);
  }

  private String getScriptArgs(String cmd) {
    int end = cmd.indexOf(" ");
    return (end == -1) ? "" : cmd.substring(end, cmd.length());
  }

  static int getPositionFromInternalName(String internalName) {
    return HiveConf.getPositionFromInternalName(internalName);
  }

  private String fetchFilesNotInLocalFilesystem(String cmd) {
    SessionState ss = SessionState.get();
    String progName = getScriptProgName(cmd);

    if (!ResourceDownloader.isFileUri(progName)) {
      String filePath = ss.add_resource(ResourceType.FILE, progName, true);
      Path p = new Path(filePath);
      String fileName = p.getName();
      String scriptArgs = getScriptArgs(cmd);
      String finalCmd = fileName + scriptArgs;
      return finalCmd;
    }

    return cmd;
  }

  private TableDesc getTableDescFromSerDe(ASTNode child, String cols,
      String colTypes, boolean defaultCols) throws SemanticException {
    if (child.getType() == HiveParser.TOK_SERDENAME) {
      String serdeName = unescapeSQLString(child.getChild(0).getText());
      Class serdeClass = null;

      try {
        serdeClass = (Class) Class.forName(serdeName,
            true, Utilities.getSessionSpecifiedClassLoader());
      } catch (ClassNotFoundException e) {
        throw new SemanticException(e);
      }

      TableDesc tblDesc = PlanUtils.getTableDesc(serdeClass, Integer
          .toString(Utilities.tabCode), cols, colTypes, defaultCols);
      // copy all the properties
      if (child.getChildCount() == 2) {
        ASTNode prop = (ASTNode) ((ASTNode) child.getChild(1)).getChild(0);
        for (int propChild = 0; propChild < prop.getChildCount(); propChild++) {
          String key = unescapeSQLString(prop.getChild(propChild).getChild(0)
              .getText());
          String value = unescapeSQLString(prop.getChild(propChild).getChild(1)
              .getText());
          tblDesc.getProperties().setProperty(key, value);
        }
      }
      return tblDesc;
    } else if (child.getType() == HiveParser.TOK_SERDEPROPS) {
      TableDesc tblDesc = PlanUtils.getDefaultTableDesc(Integer
          .toString(Utilities.ctrlaCode), cols, colTypes, defaultCols);
      int numChildRowFormat = child.getChildCount();
      for (int numC = 0; numC < numChildRowFormat; numC++) {
        ASTNode rowChild = (ASTNode) child.getChild(numC);
        switch (rowChild.getToken().getType()) {
        case HiveParser.TOK_TABLEROWFORMATFIELD:
          String fieldDelim = unescapeSQLString(rowChild.getChild(0).getText());
          tblDesc.getProperties()
              .setProperty(serdeConstants.FIELD_DELIM, fieldDelim);
          tblDesc.getProperties().setProperty(serdeConstants.SERIALIZATION_FORMAT,
              fieldDelim);

          if (rowChild.getChildCount() >= 2) {
            String fieldEscape = unescapeSQLString(rowChild.getChild(1)
                .getText());
            tblDesc.getProperties().setProperty(serdeConstants.ESCAPE_CHAR,
                fieldEscape);
          }
          break;
        case HiveParser.TOK_TABLEROWFORMATCOLLITEMS:
          tblDesc.getProperties().setProperty(serdeConstants.COLLECTION_DELIM,
              unescapeSQLString(rowChild.getChild(0).getText()));
          break;
        case HiveParser.TOK_TABLEROWFORMATMAPKEYS:
          tblDesc.getProperties().setProperty(serdeConstants.MAPKEY_DELIM,
              unescapeSQLString(rowChild.getChild(0).getText()));
          break;
        case HiveParser.TOK_TABLEROWFORMATLINES:
          String lineDelim = unescapeSQLString(rowChild.getChild(0).getText());
          tblDesc.getProperties().setProperty(serdeConstants.LINE_DELIM, lineDelim);
          if (!lineDelim.equals("\n") && !lineDelim.equals("10")) {
            throw new SemanticException(generateErrorMessage(rowChild,
                ErrorMsg.LINES_TERMINATED_BY_NON_NEWLINE.getMsg()));
          }
          break;
        case HiveParser.TOK_TABLEROWFORMATNULL:
          String nullFormat = unescapeSQLString(rowChild.getChild(0).getText());
          tblDesc.getProperties().setProperty(serdeConstants.SERIALIZATION_NULL_FORMAT,
              nullFormat);
          break;
        default:
          assert false;
        }
      }

      return tblDesc;
    }

    // should never come here
    return null;
  }

  private void failIfColAliasExists(Set nameSet, String name)
      throws SemanticException {
    if (nameSet.contains(name)) {
      throw new SemanticException(ErrorMsg.COLUMN_ALIAS_ALREADY_EXISTS
          .getMsg(name));
    }
    nameSet.add(name);
  }

  @SuppressWarnings("nls")
  private Operator genScriptPlan(ASTNode trfm, QB qb, Operator input)
      throws SemanticException {
    // If there is no "AS" clause, the output schema will be "key,value"
    ArrayList outputCols = new ArrayList();
    int inputSerDeNum = 1, inputRecordWriterNum = 2;
    int outputSerDeNum = 4, outputRecordReaderNum = 5;
    int outputColsNum = 6;
    boolean outputColNames = false, outputColSchemas = false;
    int execPos = 3;
    boolean defaultOutputCols = false;

    // Go over all the children
    if (trfm.getChildCount() > outputColsNum) {
      ASTNode outCols = (ASTNode) trfm.getChild(outputColsNum);
      if (outCols.getType() == HiveParser.TOK_ALIASLIST) {
        outputColNames = true;
      } else if (outCols.getType() == HiveParser.TOK_TABCOLLIST) {
        outputColSchemas = true;
      }
    }

    // If column type is not specified, use a string
    if (!outputColNames && !outputColSchemas) {
      String intName = getColumnInternalName(0);
      ColumnInfo colInfo = new ColumnInfo(intName,
          TypeInfoFactory.stringTypeInfo, null, false);
      colInfo.setAlias("key");
      outputCols.add(colInfo);
      intName = getColumnInternalName(1);
      colInfo = new ColumnInfo(intName, TypeInfoFactory.stringTypeInfo, null,
          false);
      colInfo.setAlias("value");
      outputCols.add(colInfo);
      defaultOutputCols = true;
    } else {
      ASTNode collist = (ASTNode) trfm.getChild(outputColsNum);
      int ccount = collist.getChildCount();

      Set colAliasNamesDuplicateCheck = new HashSet();
      if (outputColNames) {
        for (int i = 0; i < ccount; ++i) {
          String colAlias = unescapeIdentifier(((ASTNode) collist.getChild(i))
              .getText()).toLowerCase();
          failIfColAliasExists(colAliasNamesDuplicateCheck, colAlias);
          String intName = getColumnInternalName(i);
          ColumnInfo colInfo = new ColumnInfo(intName,
              TypeInfoFactory.stringTypeInfo, null, false);
          colInfo.setAlias(colAlias);
          outputCols.add(colInfo);
        }
      } else {
        for (int i = 0; i < ccount; ++i) {
          ASTNode child = (ASTNode) collist.getChild(i);
          assert child.getType() == HiveParser.TOK_TABCOL;
          String colAlias = unescapeIdentifier(((ASTNode) child.getChild(0))
              .getText()).toLowerCase();
          failIfColAliasExists(colAliasNamesDuplicateCheck, colAlias);
          String intName = getColumnInternalName(i);
          ColumnInfo colInfo = new ColumnInfo(intName, TypeInfoUtils
              .getTypeInfoFromTypeString(getTypeStringFromAST((ASTNode) child
                  .getChild(1))), null, false);
          colInfo.setAlias(colAlias);
          outputCols.add(colInfo);
        }
      }
    }

    RowResolver out_rwsch = new RowResolver();
    StringBuilder columns = new StringBuilder();
    StringBuilder columnTypes = new StringBuilder();

    for (int i = 0; i < outputCols.size(); ++i) {
      if (i != 0) {
        columns.append(",");
        columnTypes.append(",");
      }

      columns.append(outputCols.get(i).getInternalName());
      columnTypes.append(outputCols.get(i).getType().getTypeName());

      out_rwsch.put(qb.getParseInfo().getAlias(), outputCols.get(i).getAlias(),
          outputCols.get(i));
    }

    StringBuilder inpColumns = new StringBuilder();
    StringBuilder inpColumnTypes = new StringBuilder();
    ArrayList inputSchema = opParseCtx.get(input).getRowResolver()
        .getColumnInfos();
    for (int i = 0; i < inputSchema.size(); ++i) {
      if (i != 0) {
        inpColumns.append(",");
        inpColumnTypes.append(",");
      }

      inpColumns.append(inputSchema.get(i).getInternalName());
      inpColumnTypes.append(inputSchema.get(i).getType().getTypeName());
    }

    TableDesc outInfo;
    TableDesc errInfo;
    TableDesc inInfo;
    String defaultSerdeName = conf.getVar(HiveConf.ConfVars.HIVESCRIPTSERDE);
    Class serde;

    try {
      serde = (Class) Class.forName(defaultSerdeName,
          true, Utilities.getSessionSpecifiedClassLoader());
    } catch (ClassNotFoundException e) {
      throw new SemanticException(e);
    }

    int fieldSeparator = Utilities.tabCode;
    if (HiveConf.getBoolVar(conf, HiveConf.ConfVars.HIVESCRIPTESCAPE)) {
      fieldSeparator = Utilities.ctrlaCode;
    }

    // Input and Output Serdes
    if (trfm.getChild(inputSerDeNum).getChildCount() > 0) {
      inInfo = getTableDescFromSerDe((ASTNode) (((ASTNode) trfm
          .getChild(inputSerDeNum))).getChild(0), inpColumns.toString(),
          inpColumnTypes.toString(), false);
    } else {
      inInfo = PlanUtils.getTableDesc(serde, Integer
          .toString(fieldSeparator), inpColumns.toString(), inpColumnTypes
          .toString(), false, true);
    }

    if (trfm.getChild(outputSerDeNum).getChildCount() > 0) {
      outInfo = getTableDescFromSerDe((ASTNode) (((ASTNode) trfm
          .getChild(outputSerDeNum))).getChild(0), columns.toString(),
          columnTypes.toString(), false);
      // This is for backward compatibility. If the user did not specify the
      // output column list, we assume that there are 2 columns: key and value.
      // However, if the script outputs: col1, col2, col3 seperated by TAB, the
      // requirement is: key is col and value is (col2 TAB col3)
    } else {
      outInfo = PlanUtils.getTableDesc(serde, Integer
          .toString(fieldSeparator), columns.toString(), columnTypes
          .toString(), defaultOutputCols);
    }

    // Error stream always uses the default serde with a single column
    errInfo = PlanUtils.getTableDesc(serde, Integer.toString(Utilities.tabCode), "KEY");

    // Output record readers
    Class outRecordReader = getRecordReader((ASTNode) trfm
        .getChild(outputRecordReaderNum));
    Class inRecordWriter = getRecordWriter((ASTNode) trfm
        .getChild(inputRecordWriterNum));
    Class errRecordReader = getDefaultRecordReader();

    Operator output = putOpInsertMap(OperatorFactory.getAndMakeChild(new ScriptDesc(
            fetchFilesNotInLocalFilesystem(stripQuotes(trfm.getChild(execPos).getText())),
            inInfo, inRecordWriter, outInfo, outRecordReader, errRecordReader, errInfo),
        new RowSchema(out_rwsch.getColumnInfos()), input), out_rwsch);
    output.setColumnExprMap(new HashMap());  // disable backtracking

    // Add URI entity for transform script. script assumed t be local unless downloadable
    if (conf.getBoolVar(ConfVars.HIVE_CAPTURE_TRANSFORM_ENTITY)) {
      String scriptCmd = getScriptProgName(stripQuotes(trfm.getChild(execPos).getText()));
      getInputs().add(new ReadEntity(new Path(scriptCmd),
          ResourceDownloader.isFileUri(scriptCmd)));
    }

    return output;
  }

  private Class getRecordReader(ASTNode node)
      throws SemanticException {
    String name;

    if (node.getChildCount() == 0) {
      name = conf.getVar(HiveConf.ConfVars.HIVESCRIPTRECORDREADER);
    } else {
      name = unescapeSQLString(node.getChild(0).getText());
    }

    try {
      return (Class) Class.forName(name, true,
          Utilities.getSessionSpecifiedClassLoader());
    } catch (ClassNotFoundException e) {
      throw new SemanticException(e);
    }
  }

  private Class getDefaultRecordReader()
      throws SemanticException {
    String name;

    name = conf.getVar(HiveConf.ConfVars.HIVESCRIPTRECORDREADER);

    try {
      return (Class) Class.forName(name, true,
          Utilities.getSessionSpecifiedClassLoader());
    } catch (ClassNotFoundException e) {
      throw new SemanticException(e);
    }
  }

  private Class getRecordWriter(ASTNode node)
      throws SemanticException {
    String name;

    if (node.getChildCount() == 0) {
      name = conf.getVar(HiveConf.ConfVars.HIVESCRIPTRECORDWRITER);
    } else {
      name = unescapeSQLString(node.getChild(0).getText());
    }

    try {
      return (Class) Class.forName(name, true,
          Utilities.getSessionSpecifiedClassLoader());
    } catch (ClassNotFoundException e) {
      throw new SemanticException(e);
    }
  }

  protected List getGroupingSetsForRollup(int size) {
    List groupingSetKeys = new ArrayList();
    for (int i = 0; i <= size; i++) {
      groupingSetKeys.add((1 << i) - 1);
    }
    return groupingSetKeys;
  }

  protected List getGroupingSetsForCube(int size) {
    int count = 1 << size;
    List results = new ArrayList(count);
    for (int i = 0; i < count; ++i) {
      results.add(i);
    }
    return results;
  }

  // This function returns the grouping sets along with the grouping expressions
  // Even if rollups and cubes are present in the query, they are converted to
  // grouping sets at this point
  private ObjectPair, List> getGroupByGroupingSetsForClause(
      QBParseInfo parseInfo, String dest) throws SemanticException {
    List groupingSets = new ArrayList();
    List groupByExprs = getGroupByForClause(parseInfo, dest);
    if (parseInfo.getDestRollups().contains(dest)) {
      groupingSets = getGroupingSetsForRollup(groupByExprs.size());
    } else if (parseInfo.getDestCubes().contains(dest)) {
      groupingSets = getGroupingSetsForCube(groupByExprs.size());
    } else if (parseInfo.getDestGroupingSets().contains(dest)) {
      groupingSets = getGroupingSets(groupByExprs, parseInfo, dest);
    }

    return new ObjectPair, List>(groupByExprs, groupingSets);
  }

  protected List getGroupingSets(List groupByExpr, QBParseInfo parseInfo,
      String dest) throws SemanticException {
    Map exprPos = new HashMap();
    for (int i = 0; i < groupByExpr.size(); ++i) {
      ASTNode node = groupByExpr.get(i);
      exprPos.put(node.toStringTree(), i);
    }

    ASTNode root = parseInfo.getGroupByForClause(dest);
    List result = new ArrayList(root == null ? 0 : root.getChildCount());
    if (root != null) {
      for (int i = 0; i < root.getChildCount(); ++i) {
        ASTNode child = (ASTNode) root.getChild(i);
        if (child.getType() != HiveParser.TOK_GROUPING_SETS_EXPRESSION) {
          continue;
        }
        int bitmap = IntMath.pow(2, groupByExpr.size()) - 1;
        for (int j = 0; j < child.getChildCount(); ++j) {
          String treeAsString = child.getChild(j).toStringTree();
          Integer pos = exprPos.get(treeAsString);
          if (pos == null) {
            throw new SemanticException(
                generateErrorMessage((ASTNode) child.getChild(j),
                    ErrorMsg.HIVE_GROUPING_SETS_EXPR_NOT_IN_GROUPBY.getErrorCodedMsg()));
          }
          bitmap = unsetBit(bitmap, groupByExpr.size() - pos - 1);
        }
        result.add(bitmap);
      }
    }
    if (checkForEmptyGroupingSets(result, IntMath.pow(2, groupByExpr.size()) - 1)) {
      throw new SemanticException(
          ErrorMsg.HIVE_GROUPING_SETS_EMPTY.getMsg());
    }
    return result;
  }

  private boolean checkForEmptyGroupingSets(List bitmaps, int groupingIdAllSet) {
    boolean ret = true;
    for (int mask : bitmaps) {
      ret &= mask == groupingIdAllSet;
    }
    return ret;
  }

  public static int setBit(int bitmap, int bitIdx) {
    return bitmap | (1 << bitIdx);
  }

  public static int unsetBit(int bitmap, int bitIdx) {
    return bitmap & ~(1 << bitIdx);
  }

  /**
   * This function is a wrapper of parseInfo.getGroupByForClause which
   * automatically translates SELECT DISTINCT a,b,c to SELECT a,b,c GROUP BY
   * a,b,c.
   */
  List getGroupByForClause(QBParseInfo parseInfo, String dest) throws SemanticException {
    if (parseInfo.getSelForClause(dest).getToken().getType() == HiveParser.TOK_SELECTDI) {
      ASTNode selectExprs = parseInfo.getSelForClause(dest);
      List result = new ArrayList(selectExprs == null ? 0
          : selectExprs.getChildCount());
      if (selectExprs != null) {
        for (int i = 0; i < selectExprs.getChildCount(); ++i) {
          if (((ASTNode) selectExprs.getChild(i)).getToken().getType() == HiveParser.QUERY_HINT) {
            continue;
          }
          // table.column AS alias
          ASTNode grpbyExpr = (ASTNode) selectExprs.getChild(i).getChild(0);
          result.add(grpbyExpr);
        }
      }
      return result;
    } else {
      ASTNode grpByExprs = parseInfo.getGroupByForClause(dest);
      List result = new ArrayList(grpByExprs == null ? 0
          : grpByExprs.getChildCount());
      if (grpByExprs != null) {
        for (int i = 0; i < grpByExprs.getChildCount(); ++i) {
          ASTNode grpbyExpr = (ASTNode) grpByExprs.getChild(i);
          if (grpbyExpr.getType() != HiveParser.TOK_GROUPING_SETS_EXPRESSION) {
            result.add(grpbyExpr);
          }
        }
      }
      return result;
    }
  }

  static String[] getColAlias(ASTNode selExpr, String defaultName,
      RowResolver inputRR, boolean includeFuncName, int colNum) {
    String colAlias = null;
    String tabAlias = null;
    String[] colRef = new String[2];

    //for queries with a windowing expressions, the selexpr may have a third child
    if (selExpr.getChildCount() == 2 ||
        (selExpr.getChildCount() == 3 &&
        selExpr.getChild(2).getType() == HiveParser.TOK_WINDOWSPEC)) {
      // return zz for "xx + yy AS zz"
      colAlias = unescapeIdentifier(selExpr.getChild(1).getText().toLowerCase());
      colRef[0] = tabAlias;
      colRef[1] = colAlias;
      return colRef;
    }

    ASTNode root = (ASTNode) selExpr.getChild(0);
    if (root.getType() == HiveParser.TOK_TABLE_OR_COL) {
      colAlias =
          BaseSemanticAnalyzer.unescapeIdentifier(root.getChild(0).getText().toLowerCase());
      colRef[0] = tabAlias;
      colRef[1] = colAlias;
      return colRef;
    }

    if (root.getType() == HiveParser.DOT) {
      ASTNode tab = (ASTNode) root.getChild(0);
      if (tab.getType() == HiveParser.TOK_TABLE_OR_COL) {
        String t = unescapeIdentifier(tab.getChild(0).getText());
        if (inputRR.hasTableAlias(t)) {
          tabAlias = t;
        }
      }

      // Return zz for "xx.zz" and "xx.yy.zz"
      ASTNode col = (ASTNode) root.getChild(1);
      if (col.getType() == HiveParser.Identifier) {
        colAlias = unescapeIdentifier(col.getText().toLowerCase());
      }
    }

    // if specified generate alias using func name
    if (includeFuncName && (root.getType() == HiveParser.TOK_FUNCTION)) {

      String expr_flattened = root.toStringTree();

      // remove all TOK tokens
      String expr_no_tok = expr_flattened.replaceAll("tok_\\S+", "");

      // remove all non alphanumeric letters, replace whitespace spans with underscore
      String expr_formatted = expr_no_tok.replaceAll("\\W", " ").trim().replaceAll("\\s+", "_");

      // limit length to 20 chars
      if (expr_formatted.length() > AUTOGEN_COLALIAS_PRFX_MAXLENGTH) {
        expr_formatted = expr_formatted.substring(0, AUTOGEN_COLALIAS_PRFX_MAXLENGTH);
      }

      // append colnum to make it unique
      colAlias = expr_formatted.concat("_" + colNum);
    }

    if (colAlias == null) {
      // Return defaultName if selExpr is not a simple xx.yy.zz
      colAlias = defaultName + colNum;
    }

    colRef[0] = tabAlias;
    colRef[1] = colAlias;
    return colRef;
  }

  /**
   * Returns whether the pattern is a regex expression (instead of a normal
   * string). Normal string is a string with all alphabets/digits and "_".
   */
  static boolean isRegex(String pattern, HiveConf conf) {
    String qIdSupport = HiveConf.getVar(conf, HiveConf.ConfVars.HIVE_QUOTEDID_SUPPORT);
    if ( "column".equals(qIdSupport)) {
      return false;
    }
    for (int i = 0; i < pattern.length(); i++) {
      if (!Character.isLetterOrDigit(pattern.charAt(i))
          && pattern.charAt(i) != '_') {
        return true;
      }
    }
    return false;
  }


  private Operator genSelectPlan(String dest, QB qb, Operator input,
      Operator inputForSelectStar) throws SemanticException {
    ASTNode selExprList = qb.getParseInfo().getSelForClause(dest);
    Operator op = genSelectPlan(dest, selExprList, qb, input, inputForSelectStar, false);

    if (LOG.isDebugEnabled()) {
      LOG.debug("Created Select Plan for clause: " + dest);
    }

    return op;
  }

  @SuppressWarnings("nls")
  private Operator genSelectPlan(String dest, ASTNode selExprList, QB qb, Operator input,
      Operator inputForSelectStar, boolean outerLV) throws SemanticException {

    if (LOG.isDebugEnabled()) {
      LOG.debug("tree: " + selExprList.toStringTree());
    }

    ArrayList col_list = new ArrayList();
    RowResolver out_rwsch = new RowResolver();
    ASTNode trfm = null;
    Integer pos = Integer.valueOf(0);
    RowResolver inputRR = opParseCtx.get(input).getRowResolver();
    RowResolver starRR = null;
    if (inputForSelectStar != null && inputForSelectStar != input) {
      starRR = opParseCtx.get(inputForSelectStar).getRowResolver();
    }
    // SELECT * or SELECT TRANSFORM(*)
    boolean selectStar = false;
    int posn = 0;
    boolean hintPresent = (selExprList.getChild(0).getType() == HiveParser.QUERY_HINT);
    if (hintPresent) {
      posn++;
    }

    boolean isInTransform = (selExprList.getChild(posn).getChild(0).getType() ==
        HiveParser.TOK_TRANSFORM);
    if (isInTransform) {
      queryProperties.setUsesScript(true);
      globalLimitCtx.setHasTransformOrUDTF(true);
      trfm = (ASTNode) selExprList.getChild(posn).getChild(0);
    }

    // Detect queries of the form SELECT udtf(col) AS ...
    // by looking for a function as the first child, and then checking to see
    // if the function is a Generic UDTF. It's not as clean as TRANSFORM due to
    // the lack of a special token.
    boolean isUDTF = false;
    String udtfTableAlias = null;
    ArrayList udtfColAliases = new ArrayList();
    ASTNode udtfExpr = (ASTNode) selExprList.getChild(posn).getChild(0);
    GenericUDTF genericUDTF = null;

    int udtfExprType = udtfExpr.getType();
    if (udtfExprType == HiveParser.TOK_FUNCTION
        || udtfExprType == HiveParser.TOK_FUNCTIONSTAR) {
      String funcName = TypeCheckProcFactory.DefaultExprProcessor
          .getFunctionText(udtfExpr, true);
      FunctionInfo fi = FunctionRegistry.getFunctionInfo(funcName);
      if (fi != null) {
        genericUDTF = fi.getGenericUDTF();
      }
      isUDTF = (genericUDTF != null);
      if (isUDTF) {
        globalLimitCtx.setHasTransformOrUDTF(true);
      }
      if (isUDTF && !fi.isNative()) {
        unparseTranslator.addIdentifierTranslation((ASTNode) udtfExpr
            .getChild(0));
      }
      if (isUDTF && (selectStar = udtfExprType == HiveParser.TOK_FUNCTIONSTAR)) {
        genColListRegex(".*", null, (ASTNode) udtfExpr.getChild(0),
            col_list, null, inputRR, starRR, pos, out_rwsch, qb.getAliases(), false);
      }
    }

    if (isUDTF) {
      // Only support a single expression when it's a UDTF
      if (selExprList.getChildCount() > 1) {
        throw new SemanticException(generateErrorMessage(
            (ASTNode) selExprList.getChild(1),
            ErrorMsg.UDTF_MULTIPLE_EXPR.getMsg()));
      }

      ASTNode selExpr = (ASTNode) selExprList.getChild(posn);

      // Get the column / table aliases from the expression. Start from 1 as
      // 0 is the TOK_FUNCTION
      // column names also can be inferred from result of UDTF
      for (int i = 1; i < selExpr.getChildCount(); i++) {
        ASTNode selExprChild = (ASTNode) selExpr.getChild(i);
        switch (selExprChild.getType()) {
        case HiveParser.Identifier:
          udtfColAliases.add(unescapeIdentifier(selExprChild.getText().toLowerCase()));
          unparseTranslator.addIdentifierTranslation(selExprChild);
          break;
        case HiveParser.TOK_TABALIAS:
          assert (selExprChild.getChildCount() == 1);
          udtfTableAlias = unescapeIdentifier(selExprChild.getChild(0)
              .getText());
          qb.addAlias(udtfTableAlias);
          unparseTranslator.addIdentifierTranslation((ASTNode) selExprChild
              .getChild(0));
          break;
        default:
          assert (false);
        }
      }
      if (LOG.isDebugEnabled()) {
        LOG.debug("UDTF table alias is " + udtfTableAlias);
        LOG.debug("UDTF col aliases are " + udtfColAliases);
      }
    }

    // The list of expressions after SELECT or SELECT TRANSFORM.
    ASTNode exprList;
    if (isInTransform) {
      exprList = (ASTNode) trfm.getChild(0);
    } else if (isUDTF) {
      exprList = udtfExpr;
    } else {
      exprList = selExprList;
    }

    if (LOG.isDebugEnabled()) {
      LOG.debug("genSelectPlan: input = " + inputRR + " starRr = " + starRR);
    }

    // For UDTF's, skip the function name to get the expressions
    int startPosn = isUDTF ? posn + 1 : posn;
    if (isInTransform) {
      startPosn = 0;
    }

    final boolean cubeRollupGrpSetPresent = (!qb.getParseInfo().getDestRollups().isEmpty()
            || !qb.getParseInfo().getDestGroupingSets().isEmpty()
            || !qb.getParseInfo().getDestCubes().isEmpty());
    Set colAliases = new HashSet();
    ASTNode[] exprs = new ASTNode[exprList.getChildCount()];
    String[][] aliases = new String[exprList.getChildCount()][];
    boolean[] hasAsClauses = new boolean[exprList.getChildCount()];
    int offset = 0;
    // Iterate over all expression (either after SELECT, or in SELECT TRANSFORM)
    for (int i = startPosn; i < exprList.getChildCount(); ++i) {

      // child can be EXPR AS ALIAS, or EXPR.
      ASTNode child = (ASTNode) exprList.getChild(i);
      boolean hasAsClause = (!isInTransform) && (child.getChildCount() == 2);
      boolean isWindowSpec = child.getChildCount() == 3 &&
          child.getChild(2).getType() == HiveParser.TOK_WINDOWSPEC;

      // EXPR AS (ALIAS,...) parses, but is only allowed for UDTF's
      // This check is not needed and invalid when there is a transform b/c the
      // AST's are slightly different.
      if (!isWindowSpec && !isInTransform && !isUDTF && child.getChildCount() > 2) {
        throw new SemanticException(generateErrorMessage(
            (ASTNode) child.getChild(2),
            ErrorMsg.INVALID_AS.getMsg()));
      }

      // The real expression
      ASTNode expr;
      String tabAlias;
      String colAlias;

      if (isInTransform || isUDTF) {
        tabAlias = null;
        colAlias = autogenColAliasPrfxLbl + i;
        expr = child;
      } else {
        // Get rid of TOK_SELEXPR
        expr = (ASTNode) child.getChild(0);
        String[] colRef = getColAlias(child, autogenColAliasPrfxLbl, inputRR,
            autogenColAliasPrfxIncludeFuncName, i + offset);
        tabAlias = colRef[0];
        colAlias = colRef[1];
        if (hasAsClause) {
          unparseTranslator.addIdentifierTranslation((ASTNode) child
              .getChild(1));
        }
      }
      exprs[i] = expr;
      aliases[i] = new String[] {tabAlias, colAlias};
      hasAsClauses[i] = hasAsClause;
      colAliases.add(colAlias);

      // The real expression
      if (expr.getType() == HiveParser.TOK_ALLCOLREF) {
        int initPos = pos;
        pos = genColListRegex(".*", expr.getChildCount() == 0 ? null
            : getUnescapedName((ASTNode) expr.getChild(0)).toLowerCase(),
            expr, col_list, null, inputRR, starRR, pos, out_rwsch, qb.getAliases(), false);
        if (unparseTranslator.isEnabled()) {
          offset += pos - initPos - 1;
        }
        selectStar = true;
      } else if (expr.getType() == HiveParser.TOK_TABLE_OR_COL && !hasAsClause
          && !inputRR.getIsExprResolver()
          && isRegex(unescapeIdentifier(expr.getChild(0).getText()), conf)) {
        // In case the expression is a regex COL.
        // This can only happen without AS clause
        // We don't allow this for ExprResolver - the Group By case
        pos = genColListRegex(unescapeIdentifier(expr.getChild(0).getText()),
            null, expr, col_list, null, inputRR, starRR, pos, out_rwsch, qb.getAliases(), false);
      } else if (expr.getType() == HiveParser.DOT
          && expr.getChild(0).getType() == HiveParser.TOK_TABLE_OR_COL
          && inputRR.hasTableAlias(unescapeIdentifier(expr.getChild(0)
              .getChild(0).getText().toLowerCase())) && !hasAsClause
          && !inputRR.getIsExprResolver()
          && isRegex(unescapeIdentifier(expr.getChild(1).getText()), conf)) {
        // In case the expression is TABLE.COL (col can be regex).
        // This can only happen without AS clause
        // We don't allow this for ExprResolver - the Group By case
        pos = genColListRegex(unescapeIdentifier(expr.getChild(1).getText()),
            unescapeIdentifier(expr.getChild(0).getChild(0).getText().toLowerCase()),
             expr, col_list, null, inputRR, starRR, pos, out_rwsch, qb.getAliases(), false);
      } else {
        // Case when this is an expression
        TypeCheckCtx tcCtx = new TypeCheckCtx(inputRR, true, isCBOExecuted());
        // We allow stateful functions in the SELECT list (but nowhere else)
        tcCtx.setAllowStatefulFunctions(true);
        tcCtx.setAllowDistinctFunctions(false);
        if (!isCBOExecuted() && !qb.getParseInfo().getDestToGroupBy().isEmpty()) {
          // If CBO did not optimize the query, we might need to replace grouping function
          // Special handling of grouping function
          expr = rewriteGroupingFunctionAST(getGroupByForClause(qb.getParseInfo(), dest), expr,
              !cubeRollupGrpSetPresent);
        }
        ExprNodeDesc exp = genExprNodeDesc(expr, inputRR, tcCtx);
        String recommended = recommendName(exp, colAlias);
        if (recommended != null && !colAliases.contains(recommended) &&
            out_rwsch.get(null, recommended) == null) {
          colAlias = recommended;
        }
        col_list.add(exp);

        ColumnInfo colInfo = new ColumnInfo(getColumnInternalName(pos),
            exp.getWritableObjectInspector(), tabAlias, false);
        colInfo.setSkewedCol((exp instanceof ExprNodeColumnDesc) ? ((ExprNodeColumnDesc) exp)
            .isSkewedCol() : false);
        out_rwsch.put(tabAlias, colAlias, colInfo);

        if ( exp instanceof ExprNodeColumnDesc ) {
          ExprNodeColumnDesc colExp = (ExprNodeColumnDesc) exp;
          String[] altMapping = inputRR.getAlternateMappings(colExp.getColumn());
          if ( altMapping != null ) {
            out_rwsch.put(altMapping[0], altMapping[1], colInfo);
          }
        }

        pos = Integer.valueOf(pos.intValue() + 1);
      }
    }
    selectStar = selectStar && exprList.getChildCount() == posn + 1;

    out_rwsch = handleInsertStatementSpec(col_list, dest, out_rwsch, inputRR, qb, selExprList);

    ArrayList columnNames = new ArrayList();
    Map colExprMap = new HashMap();
    for (int i = 0; i < col_list.size(); i++) {
      String outputCol = getColumnInternalName(i);
      colExprMap.put(outputCol, col_list.get(i));
      columnNames.add(outputCol);
    }

    Operator output = putOpInsertMap(OperatorFactory.getAndMakeChild(
        new SelectDesc(col_list, columnNames, selectStar), new RowSchema(
            out_rwsch.getColumnInfos()), input), out_rwsch);

    output.setColumnExprMap(colExprMap);
    if (isInTransform) {
      output = genScriptPlan(trfm, qb, output);
    }

    if (isUDTF) {
      output = genUDTFPlan(genericUDTF, udtfTableAlias, udtfColAliases, qb,
          output, outerLV);
    }

    if (LOG.isDebugEnabled()) {
      LOG.debug("Created Select Plan row schema: " + out_rwsch.toString());
    }
    return output;
  }

  /**
   * This modifies the Select projections when the Select is part of an insert statement and
   * the insert statement specifies a column list for the target table, e.g.
   * create table source (a int, b int);
   * create table target (x int, y int, z int);
   * insert into target(z,x) select * from source
   *
   * Once the * is resolved to 'a,b', this list needs to rewritten to 'b,null,a' so that it looks
   * as if the original query was written as
   * insert into target select b, null, a from source
   *
   * if target schema is not specified, this is no-op
   *
   * @see #handleInsertStatementSpecPhase1(ASTNode, QBParseInfo, org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.Phase1Ctx)
   * @throws SemanticException
   */
  public RowResolver handleInsertStatementSpec(List col_list, String dest,
                                         RowResolver outputRR, RowResolver inputRR, QB qb,
                                         ASTNode selExprList) throws SemanticException {
    //(z,x)
    List targetTableSchema = qb.getParseInfo().getDestSchemaForClause(dest);//specified in the query
    if(targetTableSchema == null) {
      //no insert schema was specified
      return outputRR;
    }
    if(targetTableSchema.size() != col_list.size()) {
      Table target = qb.getMetaData().getDestTableForAlias(dest);
      Partition partition = target == null ? qb.getMetaData().getDestPartitionForAlias(dest) : null;
      throw new SemanticException(generateErrorMessage(selExprList,
        "Expected " + targetTableSchema.size() + " columns for " + dest +
          (target != null ? "/" + target.getCompleteName() : (partition != null ? "/" + partition.getCompleteName() : "")) +
          "; select produces " + col_list.size() + " columns"));
    }
    //e.g. map z->expr for a
    Map targetCol2Projection = new HashMap();
    //e.g. map z->ColumnInfo for a
    Map targetCol2ColumnInfo = new HashMap();
    int colListPos = 0;
    for(String targetCol : targetTableSchema) {
      targetCol2ColumnInfo.put(targetCol, outputRR.getColumnInfos().get(colListPos));
      targetCol2Projection.put(targetCol, col_list.get(colListPos++));
    }
    Table target = qb.getMetaData().getDestTableForAlias(dest);
    Partition partition = target == null ? qb.getMetaData().getDestPartitionForAlias(dest) : null;
    if(target == null && partition == null) {
      throw new SemanticException(generateErrorMessage(selExprList,
        "No table/partition found in QB metadata for dest='" + dest + "'"));
    }
    ArrayList new_col_list = new ArrayList();
    colListPos = 0;
    List targetTableCols = target != null ? target.getCols() : partition.getCols();
    List targetTableColNames = new ArrayList();
    List targetTableColTypes = new ArrayList();
    for(FieldSchema fs : targetTableCols) {
      targetTableColNames.add(fs.getName());
      targetTableColTypes.add(TypeInfoUtils.getTypeInfoFromTypeString(fs.getType()));
    }
    Map partSpec = qb.getMetaData().getPartSpecForAlias(dest);
    if(partSpec != null) {
      //find dynamic partition columns
      //relies on consistent order via LinkedHashMap
      for(Map.Entry partKeyVal : partSpec.entrySet()) {
        if (partKeyVal.getValue() == null) {
          targetTableColNames.add(partKeyVal.getKey());//these must be after non-partition cols
          targetTableColTypes.add(TypeInfoFactory.stringTypeInfo);
        }
      }
    }
    RowResolver newOutputRR = new RowResolver();
    //now make the select produce , with
    //where missing columns are NULL-filled
    for (int i = 0; i < targetTableColNames.size(); i++) {
      String f = targetTableColNames.get(i);
      if(targetCol2Projection.containsKey(f)) {
        //put existing column in new list to make sure it is in the right position
        new_col_list.add(targetCol2Projection.get(f));
        ColumnInfo ci = targetCol2ColumnInfo.get(f);//todo: is this OK?
        ci.setInternalName(getColumnInternalName(colListPos));
        newOutputRR.put(ci.getTabAlias(), ci.getInternalName(), ci);
      }
      else {
        //add new 'synthetic' columns for projections not provided by Select
        ExprNodeDesc exp = new ExprNodeConstantDesc(targetTableColTypes.get(i), null);
        new_col_list.add(exp);
        final String tableAlias = null;//this column doesn't come from any table
        ColumnInfo colInfo = new ColumnInfo(getColumnInternalName(colListPos),
          exp.getWritableObjectInspector(), tableAlias, false);
        newOutputRR.put(colInfo.getTabAlias(), colInfo.getInternalName(), colInfo);
      }
      colListPos++;
    }
    col_list.clear();
    col_list.addAll(new_col_list);
    return newOutputRR;
  }
  String recommendName(ExprNodeDesc exp, String colAlias) {
    if (!colAlias.startsWith(autogenColAliasPrfxLbl)) {
      return null;
    }
    String column = ExprNodeDescUtils.recommendInputName(exp);
    if (column != null && !column.startsWith(autogenColAliasPrfxLbl)) {
      return column;
    }
    return null;
  }

  String getAutogenColAliasPrfxLbl() {
    return this.autogenColAliasPrfxLbl;
  }

  boolean autogenColAliasPrfxIncludeFuncName() {
    return this.autogenColAliasPrfxIncludeFuncName;
  }

  /**
   * Class to store GenericUDAF related information.
   */
  public static class GenericUDAFInfo {
    public ArrayList convertedParameters;
    public GenericUDAFEvaluator genericUDAFEvaluator;
    public TypeInfo returnType;
  }

  /**
   * Convert exprNodeDesc array to Typeinfo array.
   */
  static ArrayList getTypeInfo(ArrayList exprs) {
    ArrayList result = new ArrayList();
    for (ExprNodeDesc expr : exprs) {
      result.add(expr.getTypeInfo());
    }
    return result;
  }

  /**
   * Convert exprNodeDesc array to ObjectInspector array.
   */
  static ArrayList getWritableObjectInspector(ArrayList exprs) {
    ArrayList result = new ArrayList();
    for (ExprNodeDesc expr : exprs) {
      result.add(expr.getWritableObjectInspector());
    }
    return result;
  }

  /**
   * Convert exprNodeDesc array to Typeinfo array.
   */
  static ObjectInspector[] getStandardObjectInspector(ArrayList exprs) {
    ObjectInspector[] result = new ObjectInspector[exprs.size()];
    for (int i = 0; i < exprs.size(); i++) {
      result[i] = TypeInfoUtils
          .getStandardWritableObjectInspectorFromTypeInfo(exprs.get(i));
    }
    return result;
  }

  /**
   * Returns the GenericUDAFEvaluator for the aggregation. This is called once
   * for each GroupBy aggregation.
   */
  public static GenericUDAFEvaluator getGenericUDAFEvaluator(String aggName,
      ArrayList aggParameters, ASTNode aggTree,
      boolean isDistinct, boolean isAllColumns)
      throws SemanticException {
    ArrayList originalParameterTypeInfos =
        getWritableObjectInspector(aggParameters);
    GenericUDAFEvaluator result = FunctionRegistry.getGenericUDAFEvaluator(
        aggName, originalParameterTypeInfos, isDistinct, isAllColumns);
    if (null == result) {
      String reason = "Looking for UDAF Evaluator\"" + aggName
          + "\" with parameters " + originalParameterTypeInfos;
      throw new SemanticException(ErrorMsg.INVALID_FUNCTION_SIGNATURE.getMsg(
          (ASTNode) aggTree.getChild(0), reason));
    }
    return result;
  }

  /**
   * Returns the GenericUDAFInfo struct for the aggregation.
   *
   * @param evaluator
   * @param emode
   * @param aggParameters
   *          The exprNodeDesc of the original parameters
   * @return GenericUDAFInfo
   * @throws SemanticException
   *           when the UDAF is not found or has problems.
   */
  public static GenericUDAFInfo getGenericUDAFInfo(GenericUDAFEvaluator evaluator,
      GenericUDAFEvaluator.Mode emode, ArrayList aggParameters)
      throws SemanticException {

    GenericUDAFInfo r = new GenericUDAFInfo();

    // set r.genericUDAFEvaluator
    r.genericUDAFEvaluator = evaluator;

    // set r.returnType
    ObjectInspector returnOI = null;
    try {
      ArrayList aggOIs = getWritableObjectInspector(aggParameters);
      ObjectInspector[] aggOIArray = new ObjectInspector[aggOIs.size()];
      for (int ii = 0; ii < aggOIs.size(); ++ii) {
        aggOIArray[ii] = aggOIs.get(ii);
      }
      returnOI = r.genericUDAFEvaluator.init(emode, aggOIArray);
      r.returnType = TypeInfoUtils.getTypeInfoFromObjectInspector(returnOI);
    } catch (HiveException e) {
      throw new SemanticException(e);
    }
    // set r.convertedParameters
    // TODO: type conversion
    r.convertedParameters = aggParameters;

    return r;
  }

  public static GenericUDAFEvaluator.Mode groupByDescModeToUDAFMode(
      GroupByDesc.Mode mode, boolean isDistinct) {
    switch (mode) {
    case COMPLETE:
      return GenericUDAFEvaluator.Mode.COMPLETE;
    case PARTIAL1:
      return GenericUDAFEvaluator.Mode.PARTIAL1;
    case PARTIAL2:
      return GenericUDAFEvaluator.Mode.PARTIAL2;
    case PARTIALS:
      return isDistinct ? GenericUDAFEvaluator.Mode.PARTIAL1
          : GenericUDAFEvaluator.Mode.PARTIAL2;
    case FINAL:
      return GenericUDAFEvaluator.Mode.FINAL;
    case HASH:
      return GenericUDAFEvaluator.Mode.PARTIAL1;
    case MERGEPARTIAL:
      return isDistinct ? GenericUDAFEvaluator.Mode.COMPLETE
          : GenericUDAFEvaluator.Mode.FINAL;
    default:
      throw new RuntimeException("internal error in groupByDescModeToUDAFMode");
    }
  }

  /**
   * Check if the given internalName represents a constant parameter in aggregation parameters
   * of an aggregation tree.
   * This method is only invoked when map-side aggregation is not involved. In this case,
   * every parameter in every aggregation tree should already have a corresponding ColumnInfo,
   * which is generated when the corresponding ReduceSinkOperator of the GroupByOperator being
   * generating is generated. If we find that this parameter is a constant parameter,
   * we will return the corresponding ExprNodeDesc in reduceValues, and we will not need to
   * use a new ExprNodeColumnDesc, which can not be treated as a constant parameter, for this
   * parameter (since the writableObjectInspector of a ExprNodeColumnDesc will not be
   * a instance of ConstantObjectInspector).
   *
   * @param reduceValues
   *          value columns of the corresponding ReduceSinkOperator
   * @param internalName
   *          the internal name of this parameter
   * @return the ExprNodeDesc of the constant parameter if the given internalName represents
   *         a constant parameter; otherwise, return null
   */
  public static ExprNodeDesc isConstantParameterInAggregationParameters(String internalName,
      List reduceValues) {
    // only the pattern of "VALUE._col([0-9]+)" should be handled.

    String[] terms = internalName.split("\\.");
    if (terms.length != 2 || reduceValues == null) {
      return null;
    }

    if (Utilities.ReduceField.VALUE.toString().equals(terms[0])) {
      int pos = getPositionFromInternalName(terms[1]);
      if (pos >= 0 && pos < reduceValues.size()) {
        ExprNodeDesc reduceValue = reduceValues.get(pos);
        if (reduceValue != null) {
          if (reduceValue.getWritableObjectInspector() instanceof ConstantObjectInspector) {
            // this internalName represents a constant parameter in aggregation parameters
            return reduceValue;
          }
        }
      }
    }

    return null;
  }

  /**
   * Generate the GroupByOperator for the Query Block (parseInfo.getXXX(dest)).
   * The new GroupByOperator will be a child of the reduceSinkOperatorInfo.
   *
   * @param mode
   *          The mode of the aggregation (PARTIAL1 or COMPLETE)
   * @param genericUDAFEvaluators
   *          If not null, this function will store the mapping from Aggregation
   *          StringTree to the genericUDAFEvaluator in this parameter, so it
   *          can be used in the next-stage GroupBy aggregations.
   * @return the new GroupByOperator
   */
  @SuppressWarnings("nls")
  private Operator genGroupByPlanGroupByOperator(QBParseInfo parseInfo,
      String dest, Operator input, ReduceSinkOperator rs, GroupByDesc.Mode mode,
      Map genericUDAFEvaluators)
      throws SemanticException {
    RowResolver groupByInputRowResolver = opParseCtx
        .get(input).getRowResolver();
    RowResolver groupByOutputRowResolver = new RowResolver();
    groupByOutputRowResolver.setIsExprResolver(true);
    ArrayList groupByKeys = new ArrayList();
    ArrayList aggregations = new ArrayList();
    ArrayList outputColumnNames = new ArrayList();
    Map colExprMap = new HashMap();
    List grpByExprs = getGroupByForClause(parseInfo, dest);
    for (int i = 0; i < grpByExprs.size(); ++i) {
      ASTNode grpbyExpr = grpByExprs.get(i);
      ColumnInfo exprInfo = groupByInputRowResolver.getExpression(grpbyExpr);

      if (exprInfo == null) {
        throw new SemanticException(ErrorMsg.INVALID_COLUMN.getMsg(grpbyExpr));
      }

      groupByKeys.add(new ExprNodeColumnDesc(exprInfo.getType(), exprInfo
          .getInternalName(), "", false));
      String field = getColumnInternalName(i);
      outputColumnNames.add(field);
      ColumnInfo oColInfo = new ColumnInfo(field, exprInfo.getType(), null, false);
      groupByOutputRowResolver.putExpression(grpbyExpr,
          oColInfo);
      addAlternateGByKeyMappings(grpbyExpr, oColInfo, input, groupByOutputRowResolver);
      colExprMap.put(field, groupByKeys.get(groupByKeys.size() - 1));
    }
    // For each aggregation
    HashMap aggregationTrees = parseInfo
        .getAggregationExprsForClause(dest);
    assert (aggregationTrees != null);
    // get the last colName for the reduce KEY
    // it represents the column name corresponding to distinct aggr, if any
    String lastKeyColName = null;
    List inputKeyCols = rs.getConf().getOutputKeyColumnNames();
    if (inputKeyCols.size() > 0) {
      lastKeyColName = inputKeyCols.get(inputKeyCols.size() - 1);
    }
    List reduceValues = rs.getConf().getValueCols();
    int numDistinctUDFs = 0;
    for (Map.Entry entry : aggregationTrees.entrySet()) {
      ASTNode value = entry.getValue();

      // This is the GenericUDAF name
      String aggName = unescapeIdentifier(value.getChild(0).getText());
      boolean isDistinct = value.getType() == HiveParser.TOK_FUNCTIONDI;
      boolean isAllColumns = value.getType() == HiveParser.TOK_FUNCTIONSTAR;

      // Convert children to aggParameters
      ArrayList aggParameters = new ArrayList();
      // 0 is the function name
      for (int i = 1; i < value.getChildCount(); i++) {
        ASTNode paraExpr = (ASTNode) value.getChild(i);
        ColumnInfo paraExprInfo =
            groupByInputRowResolver.getExpression(paraExpr);
        if (paraExprInfo == null) {
          throw new SemanticException(ErrorMsg.INVALID_COLUMN.getMsg(paraExpr));
        }

        String paraExpression = paraExprInfo.getInternalName();
        assert (paraExpression != null);
        if (isDistinct && lastKeyColName != null) {
          // if aggr is distinct, the parameter is name is constructed as
          // KEY.lastKeyColName:._colx
          paraExpression = Utilities.ReduceField.KEY.name() + "." +
              lastKeyColName + ":" + numDistinctUDFs + "." +
              getColumnInternalName(i - 1);

        }

        ExprNodeDesc expr = new ExprNodeColumnDesc(paraExprInfo.getType(),
            paraExpression, paraExprInfo.getTabAlias(),
            paraExprInfo.getIsVirtualCol());
        ExprNodeDesc reduceValue = isConstantParameterInAggregationParameters(
            paraExprInfo.getInternalName(), reduceValues);

        if (reduceValue != null) {
          // this parameter is a constant
          expr = reduceValue;
        }

        aggParameters.add(expr);
      }

      if (isDistinct) {
        numDistinctUDFs++;
      }
      Mode amode = groupByDescModeToUDAFMode(mode, isDistinct);
      GenericUDAFEvaluator genericUDAFEvaluator = getGenericUDAFEvaluator(
          aggName, aggParameters, value, isDistinct, isAllColumns);
      assert (genericUDAFEvaluator != null);
      GenericUDAFInfo udaf = getGenericUDAFInfo(genericUDAFEvaluator, amode,
          aggParameters);
      aggregations.add(new AggregationDesc(aggName.toLowerCase(),
          udaf.genericUDAFEvaluator, udaf.convertedParameters, isDistinct,
          amode));
      String field = getColumnInternalName(groupByKeys.size()
          + aggregations.size() - 1);
      outputColumnNames.add(field);
      groupByOutputRowResolver.putExpression(value, new ColumnInfo(
          field, udaf.returnType, "", false));
      // Save the evaluator so that it can be used by the next-stage
      // GroupByOperators
      if (genericUDAFEvaluators != null) {
        genericUDAFEvaluators.put(entry.getKey(), genericUDAFEvaluator);
      }
    }
    float groupByMemoryUsage = HiveConf.getFloatVar(conf, HiveConf.ConfVars.HIVEMAPAGGRHASHMEMORY);
    float memoryThreshold = HiveConf
        .getFloatVar(conf, HiveConf.ConfVars.HIVEMAPAGGRMEMORYTHRESHOLD);

    Operator op = putOpInsertMap(OperatorFactory.getAndMakeChild(
        new GroupByDesc(mode, outputColumnNames, groupByKeys, aggregations,
            false, groupByMemoryUsage, memoryThreshold, null, false, -1, numDistinctUDFs > 0),
        new RowSchema(groupByOutputRowResolver.getColumnInfos()),
        input), groupByOutputRowResolver);
    op.setColumnExprMap(colExprMap);
    return op;
  }

  // Add the grouping set key to the group by operator.
  // This is not the first group by operator, but it is a subsequent group by operator
  // which is forwarding the grouping keys introduced by the grouping sets.
  // For eg: consider: select key, value, count(1) from T group by key, value with rollup.
  // Assuming map-side aggregation and no skew, the plan would look like:
  //
  // TableScan --> Select --> GroupBy1 --> ReduceSink --> GroupBy2 --> Select --> FileSink
  //
  // This function is called for GroupBy2 to pass the additional grouping keys introduced by
  // GroupBy1 for the grouping set (corresponding to the rollup).
  private void addGroupingSetKey(List groupByKeys,
      RowResolver groupByInputRowResolver,
      RowResolver groupByOutputRowResolver,
      List outputColumnNames,
      Map colExprMap) throws SemanticException {
    // For grouping sets, add a dummy grouping key
    String groupingSetColumnName =
        groupByInputRowResolver.get(null, VirtualColumn.GROUPINGID.getName()).getInternalName();
    ExprNodeDesc inputExpr = new ExprNodeColumnDesc(TypeInfoFactory.intTypeInfo,
        groupingSetColumnName, null, false);
    groupByKeys.add(inputExpr);

    String field = getColumnInternalName(groupByKeys.size() - 1);
    outputColumnNames.add(field);
    groupByOutputRowResolver.put(null, VirtualColumn.GROUPINGID.getName(),
        new ColumnInfo(
            field,
            TypeInfoFactory.intTypeInfo,
            null,
            true));
    colExprMap.put(field, groupByKeys.get(groupByKeys.size() - 1));
  }

  // Process grouping set for the reduce sink operator
  // For eg: consider: select key, value, count(1) from T group by key, value with rollup.
  // Assuming map-side aggregation and no skew, the plan would look like:
  //
  // TableScan --> Select --> GroupBy1 --> ReduceSink --> GroupBy2 --> Select --> FileSink
  //
  // This function is called for ReduceSink to add the additional grouping keys introduced by
  // GroupBy1 into the reduce keys.
  private void processGroupingSetReduceSinkOperator(RowResolver reduceSinkInputRowResolver,
      RowResolver reduceSinkOutputRowResolver,
      List reduceKeys,
      List outputKeyColumnNames,
      Map colExprMap) throws SemanticException {
    // add a key for reduce sink
    String groupingSetColumnName =
        reduceSinkInputRowResolver.get(null, VirtualColumn.GROUPINGID.getName()).getInternalName();
    ExprNodeDesc inputExpr = new ExprNodeColumnDesc(TypeInfoFactory.intTypeInfo,
        groupingSetColumnName, null, false);
    reduceKeys.add(inputExpr);

    outputKeyColumnNames.add(getColumnInternalName(reduceKeys.size() - 1));
    String field = Utilities.ReduceField.KEY.toString() + "."
        + getColumnInternalName(reduceKeys.size() - 1);
    ColumnInfo colInfo = new ColumnInfo(field, reduceKeys.get(
        reduceKeys.size() - 1).getTypeInfo(), null, true);
    reduceSinkOutputRowResolver.put(null, VirtualColumn.GROUPINGID.getName(), colInfo);
    colExprMap.put(colInfo.getInternalName(), inputExpr);
  }


  /**
   * Generate the GroupByOperator for the Query Block (parseInfo.getXXX(dest)).
   * The new GroupByOperator will be a child of the reduceSinkOperatorInfo.
   *
   * @param parseInfo
   * @param dest
   * @param reduceSinkOperatorInfo
   * @param mode
   *          The mode of the aggregation (MERGEPARTIAL, PARTIAL2)
   * @param genericUDAFEvaluators
   *          The mapping from Aggregation StringTree to the
   *          genericUDAFEvaluator.
   * @param groupingSets
   *          list of grouping sets
   * @param groupingSetsPresent
   *          whether grouping sets are present in this query
   * @param groupingSetsNeedAdditionalMRJob
   *          whether grouping sets are consumed by this group by
   * @return the new GroupByOperator
   */
  @SuppressWarnings("nls")
  private Operator genGroupByPlanGroupByOperator1(QBParseInfo parseInfo,
      String dest, Operator reduceSinkOperatorInfo, GroupByDesc.Mode mode,
      Map genericUDAFEvaluators,
      List groupingSets,
      boolean groupingSetsPresent,
      boolean groupingSetsNeedAdditionalMRJob) throws SemanticException {
    ArrayList outputColumnNames = new ArrayList();
    RowResolver groupByInputRowResolver = opParseCtx
        .get(reduceSinkOperatorInfo).getRowResolver();
    RowResolver groupByOutputRowResolver = new RowResolver();
    groupByOutputRowResolver.setIsExprResolver(true);
    ArrayList groupByKeys = new ArrayList();
    ArrayList aggregations = new ArrayList();
    List grpByExprs = getGroupByForClause(parseInfo, dest);
    Map colExprMap = new HashMap();
    for (int i = 0; i < grpByExprs.size(); ++i) {
      ASTNode grpbyExpr = grpByExprs.get(i);
      ColumnInfo exprInfo = groupByInputRowResolver.getExpression(grpbyExpr);

      if (exprInfo == null) {
        throw new SemanticException(ErrorMsg.INVALID_COLUMN.getMsg(grpbyExpr));
      }

      groupByKeys.add(new ExprNodeColumnDesc(exprInfo));
      String field = getColumnInternalName(i);
      outputColumnNames.add(field);
      ColumnInfo oColInfo = new ColumnInfo(field, exprInfo.getType(), "", false);
      groupByOutputRowResolver.putExpression(grpbyExpr,
          oColInfo);
      addAlternateGByKeyMappings(grpbyExpr, oColInfo, reduceSinkOperatorInfo, groupByOutputRowResolver);
      colExprMap.put(field, groupByKeys.get(groupByKeys.size() - 1));
    }

    // This is only needed if a new grouping set key is being created
    int groupingSetsPosition = -1;

    // For grouping sets, add a dummy grouping key
    if (groupingSetsPresent) {
      groupingSetsPosition = groupByKeys.size();
      // Consider the query: select a,b, count(1) from T group by a,b with cube;
      // where it is being executed in a single map-reduce job
      // The plan is TableScan -> GroupBy1 -> ReduceSink -> GroupBy2 -> FileSink
      // GroupBy1 already added the grouping id as part of the row
      // This function is called for GroupBy2 to add grouping id as part of the groupby keys
      if (!groupingSetsNeedAdditionalMRJob) {
        addGroupingSetKey(
            groupByKeys,
            groupByInputRowResolver,
            groupByOutputRowResolver,
            outputColumnNames,
            colExprMap);
      }
      else {
        // The grouping set has not yet been processed. Create a new grouping key
        // Consider the query: select a,b, count(1) from T group by a,b with cube;
        // where it is being executed in 2 map-reduce jobs
        // The plan for 1st MR is TableScan -> GroupBy1 -> ReduceSink -> GroupBy2 -> FileSink
        // GroupBy1/ReduceSink worked as if grouping sets were not present
        // This function is called for GroupBy2 to create new rows for grouping sets
        // For each input row (a,b), 4 rows are created for the example above:
        // (a,b), (a,null), (null, b), (null, null)
        createNewGroupingKey(groupByKeys,
            outputColumnNames,
            groupByOutputRowResolver,
            colExprMap);
      }
    }

    HashMap aggregationTrees = parseInfo
        .getAggregationExprsForClause(dest);
    // get the last colName for the reduce KEY
    // it represents the column name corresponding to distinct aggr, if any
    String lastKeyColName = null;
    List reduceValues = null;
    if (reduceSinkOperatorInfo.getConf() instanceof ReduceSinkDesc) {
      List inputKeyCols = ((ReduceSinkDesc)
          reduceSinkOperatorInfo.getConf()).getOutputKeyColumnNames();
      if (inputKeyCols.size() > 0) {
        lastKeyColName = inputKeyCols.get(inputKeyCols.size() - 1);
      }
      reduceValues = ((ReduceSinkDesc) reduceSinkOperatorInfo.getConf()).getValueCols();
    }
    int numDistinctUDFs = 0;
    boolean containsDistinctAggr = false;
    for (Map.Entry entry : aggregationTrees.entrySet()) {
      ASTNode value = entry.getValue();
      String aggName = unescapeIdentifier(value.getChild(0).getText());
      ArrayList aggParameters = new ArrayList();
      boolean isDistinct = (value.getType() == HiveParser.TOK_FUNCTIONDI);
      containsDistinctAggr = containsDistinctAggr || isDistinct;

      // If the function is distinct, partial aggregation has not been done on
      // the client side.
      // If distPartAgg is set, the client is letting us know that partial
      // aggregation has not been done.
      // For eg: select a, count(b+c), count(distinct d+e) group by a
      // For count(b+c), if partial aggregation has been performed, then we
      // directly look for count(b+c).
      // Otherwise, we look for b+c.
      // For distincts, partial aggregation is never performed on the client
      // side, so always look for the parameters: d+e
      if (isDistinct) {
        // 0 is the function name
        for (int i = 1; i < value.getChildCount(); i++) {
          ASTNode paraExpr = (ASTNode) value.getChild(i);
          ColumnInfo paraExprInfo =
              groupByInputRowResolver.getExpression(paraExpr);
          if (paraExprInfo == null) {
            throw new SemanticException(ErrorMsg.INVALID_COLUMN
                .getMsg(paraExpr));
          }

          String paraExpression = paraExprInfo.getInternalName();
          assert (paraExpression != null);
          if (isDistinct && lastKeyColName != null) {
            // if aggr is distinct, the parameter is name is constructed as
            // KEY.lastKeyColName:._colx
            paraExpression = Utilities.ReduceField.KEY.name() + "." +
                lastKeyColName + ":" + numDistinctUDFs + "."
                + getColumnInternalName(i - 1);
          }

          ExprNodeDesc expr = new ExprNodeColumnDesc(paraExprInfo.getType(),
              paraExpression, paraExprInfo.getTabAlias(),
              paraExprInfo.getIsVirtualCol());
          ExprNodeDesc reduceValue = isConstantParameterInAggregationParameters(
              paraExprInfo.getInternalName(), reduceValues);

          if (reduceValue != null) {
            // this parameter is a constant
            expr = reduceValue;
          }
          aggParameters.add(expr);
        }
      } else {
        ColumnInfo paraExprInfo = groupByInputRowResolver.getExpression(value);
        if (paraExprInfo == null) {
          throw new SemanticException(ErrorMsg.INVALID_COLUMN.getMsg(value));
        }
        String paraExpression = paraExprInfo.getInternalName();
        assert (paraExpression != null);
        aggParameters.add(new ExprNodeColumnDesc(paraExprInfo.getType(),
            paraExpression, paraExprInfo.getTabAlias(), paraExprInfo
                .getIsVirtualCol()));
      }
      if (isDistinct) {
        numDistinctUDFs++;
      }

      Mode amode = groupByDescModeToUDAFMode(mode, isDistinct);
      GenericUDAFEvaluator genericUDAFEvaluator = null;
      genericUDAFEvaluator = genericUDAFEvaluators.get(entry.getKey());
      assert (genericUDAFEvaluator != null);

      GenericUDAFInfo udaf = getGenericUDAFInfo(genericUDAFEvaluator, amode,
          aggParameters);
      aggregations.add(new AggregationDesc(aggName.toLowerCase(),
          udaf.genericUDAFEvaluator, udaf.convertedParameters,
          (mode != GroupByDesc.Mode.FINAL && isDistinct), amode));
      String field = getColumnInternalName(groupByKeys.size()
          + aggregations.size() - 1);
      outputColumnNames.add(field);
      groupByOutputRowResolver.putExpression(value, new ColumnInfo(
          field, udaf.returnType, "", false));
    }
    float groupByMemoryUsage = HiveConf.getFloatVar(conf, HiveConf.ConfVars.HIVEMAPAGGRHASHMEMORY);
    float memoryThreshold = HiveConf
        .getFloatVar(conf, HiveConf.ConfVars.HIVEMAPAGGRMEMORYTHRESHOLD);

    // Nothing special needs to be done for grouping sets if
    // this is the final group by operator, and multiple rows corresponding to the
    // grouping sets have been generated upstream.
    // However, if an addition MR job has been created to handle grouping sets,
    // additional rows corresponding to grouping sets need to be created here.
    Operator op = putOpInsertMap(OperatorFactory.getAndMakeChild(
        new GroupByDesc(mode, outputColumnNames, groupByKeys, aggregations,
            groupByMemoryUsage, memoryThreshold,
            groupingSets,
            groupingSetsPresent && groupingSetsNeedAdditionalMRJob,
            groupingSetsPosition, containsDistinctAggr),
        new RowSchema(groupByOutputRowResolver.getColumnInfos()), reduceSinkOperatorInfo),
        groupByOutputRowResolver);
    op.setColumnExprMap(colExprMap);
    return op;
  }

  /*
   * Create a new grouping key for grouping id.
   * A dummy grouping id. is added. At runtime, the group by operator
   * creates 'n' rows per input row, where 'n' is the number of grouping sets.
   */
  private void createNewGroupingKey(List groupByKeys,
      List outputColumnNames,
      RowResolver groupByOutputRowResolver,
      Map colExprMap) {
    // The value for the constant does not matter. It is replaced by the grouping set
    // value for the actual implementation
    ExprNodeConstantDesc constant = new ExprNodeConstantDesc(0);
    groupByKeys.add(constant);
    String field = getColumnInternalName(groupByKeys.size() - 1);
    outputColumnNames.add(field);
    groupByOutputRowResolver.put(null, VirtualColumn.GROUPINGID.getName(),
        new ColumnInfo(
            field,
            TypeInfoFactory.intTypeInfo,
            null,
            true));
    colExprMap.put(field, constant);
  }

  /**
   * Generate the map-side GroupByOperator for the Query Block
   * (qb.getParseInfo().getXXX(dest)). The new GroupByOperator will be a child
   * of the inputOperatorInfo.
   *
   * @param mode
   *          The mode of the aggregation (HASH)
   * @param genericUDAFEvaluators
   *          If not null, this function will store the mapping from Aggregation
   *          StringTree to the genericUDAFEvaluator in this parameter, so it
   *          can be used in the next-stage GroupBy aggregations.
   * @return the new GroupByOperator
   */
  @SuppressWarnings("nls")
  private Operator genGroupByPlanMapGroupByOperator(QB qb,
      String dest,
      List grpByExprs,
      Operator inputOperatorInfo,
      GroupByDesc.Mode mode,
      Map genericUDAFEvaluators,
      List groupingSetKeys,
      boolean groupingSetsPresent) throws SemanticException {

    RowResolver groupByInputRowResolver = opParseCtx.get(inputOperatorInfo)
        .getRowResolver();
    QBParseInfo parseInfo = qb.getParseInfo();
    RowResolver groupByOutputRowResolver = new RowResolver();
    groupByOutputRowResolver.setIsExprResolver(true);
    ArrayList groupByKeys = new ArrayList();
    ArrayList outputColumnNames = new ArrayList();
    ArrayList aggregations = new ArrayList();
    Map colExprMap = new HashMap();
    for (int i = 0; i < grpByExprs.size(); ++i) {
      ASTNode grpbyExpr = grpByExprs.get(i);
      ExprNodeDesc grpByExprNode = genExprNodeDesc(grpbyExpr,
          groupByInputRowResolver);

      if ((grpByExprNode instanceof ExprNodeColumnDesc) && ExprNodeDescUtils.indexOf(grpByExprNode, groupByKeys) >= 0) {
        // Skip duplicated grouping keys, it happens when define column alias.
        grpByExprs.remove(i--);
        continue;
      }
      groupByKeys.add(grpByExprNode);
      String field = getColumnInternalName(i);
      outputColumnNames.add(field);
      groupByOutputRowResolver.putExpression(grpbyExpr,
          new ColumnInfo(field, grpByExprNode.getTypeInfo(), "", false));
      colExprMap.put(field, groupByKeys.get(groupByKeys.size() - 1));
    }

    // The grouping set key is present after the grouping keys, before the distinct keys
    int groupingSetsPosition = -1;

    // For grouping sets, add a dummy grouping key
    // This dummy key needs to be added as a reduce key
    // For eg: consider: select key, value, count(1) from T group by key, value with rollup.
    // Assuming map-side aggregation and no skew, the plan would look like:
    //
    // TableScan --> Select --> GroupBy1 --> ReduceSink --> GroupBy2 --> Select --> FileSink
    //
    // This function is called for GroupBy1 to create an additional grouping key
    // for the grouping set (corresponding to the rollup).
    if (groupingSetsPresent) {
      groupingSetsPosition = groupByKeys.size();
      createNewGroupingKey(groupByKeys,
          outputColumnNames,
          groupByOutputRowResolver,
          colExprMap);
    }

    // If there is a distinctFuncExp, add all parameters to the reduceKeys.
    if (!parseInfo.getDistinctFuncExprsForClause(dest).isEmpty()) {
      List list = parseInfo.getDistinctFuncExprsForClause(dest);
      for (ASTNode value : list) {
        // 0 is function name
        for (int i = 1; i < value.getChildCount(); i++) {
          ASTNode parameter = (ASTNode) value.getChild(i);
          if (groupByOutputRowResolver.getExpression(parameter) == null) {
            ExprNodeDesc distExprNode = genExprNodeDesc(parameter,
                groupByInputRowResolver);
            groupByKeys.add(distExprNode);
            String field = getColumnInternalName(groupByKeys.size() - 1);
            outputColumnNames.add(field);
            groupByOutputRowResolver.putExpression(parameter, new ColumnInfo(
                field, distExprNode.getTypeInfo(), "", false));
            colExprMap.put(field, groupByKeys.get(groupByKeys.size() - 1));
          }
        }
      }
    }

    // For each aggregation
    HashMap aggregationTrees = parseInfo
        .getAggregationExprsForClause(dest);
    assert (aggregationTrees != null);

    boolean containsDistinctAggr = false;
    for (Map.Entry entry : aggregationTrees.entrySet()) {
      ASTNode value = entry.getValue();
      String aggName = unescapeIdentifier(value.getChild(0).getText());
      ArrayList aggParameters = new ArrayList();
      // 0 is the function name
      for (int i = 1; i < value.getChildCount(); i++) {
        ASTNode paraExpr = (ASTNode) value.getChild(i);
        ExprNodeDesc paraExprNode = genExprNodeDesc(paraExpr,
            groupByInputRowResolver);

        aggParameters.add(paraExprNode);
      }

      boolean isDistinct = value.getType() == HiveParser.TOK_FUNCTIONDI;
      containsDistinctAggr = containsDistinctAggr || isDistinct;
      boolean isAllColumns = value.getType() == HiveParser.TOK_FUNCTIONSTAR;
      Mode amode = groupByDescModeToUDAFMode(mode, isDistinct);

      GenericUDAFEvaluator genericUDAFEvaluator = getGenericUDAFEvaluator(
          aggName, aggParameters, value, isDistinct, isAllColumns);
      assert (genericUDAFEvaluator != null);
      GenericUDAFInfo udaf = getGenericUDAFInfo(genericUDAFEvaluator, amode,
          aggParameters);
      aggregations.add(new AggregationDesc(aggName.toLowerCase(),
          udaf.genericUDAFEvaluator, udaf.convertedParameters, isDistinct,
          amode));
      String field = getColumnInternalName(groupByKeys.size()
          + aggregations.size() - 1);
      outputColumnNames.add(field);
      if (groupByOutputRowResolver.getExpression(value) == null) {
        groupByOutputRowResolver.putExpression(value, new ColumnInfo(
            field, udaf.returnType, "", false));
      }
      // Save the evaluator so that it can be used by the next-stage
      // GroupByOperators
      if (genericUDAFEvaluators != null) {
        genericUDAFEvaluators.put(entry.getKey(), genericUDAFEvaluator);
      }
    }
    float groupByMemoryUsage = HiveConf.getFloatVar(conf, HiveConf.ConfVars.HIVEMAPAGGRHASHMEMORY);
    float memoryThreshold = HiveConf
        .getFloatVar(conf, HiveConf.ConfVars.HIVEMAPAGGRMEMORYTHRESHOLD);
    Operator op = putOpInsertMap(OperatorFactory.getAndMakeChild(
        new GroupByDesc(mode, outputColumnNames, groupByKeys, aggregations,
            false, groupByMemoryUsage, memoryThreshold,
            groupingSetKeys, groupingSetsPresent, groupingSetsPosition, containsDistinctAggr),
        new RowSchema(groupByOutputRowResolver.getColumnInfos()),
        inputOperatorInfo), groupByOutputRowResolver);
    op.setColumnExprMap(colExprMap);
    return op;
  }

  /**
   * Generate the ReduceSinkOperator for the Group By Query Block
   * (qb.getPartInfo().getXXX(dest)). The new ReduceSinkOperator will be a child
   * of inputOperatorInfo.
   *
   * It will put all Group By keys and the distinct field (if any) in the
   * map-reduce sort key, and all other fields in the map-reduce value.
   *
   * @param numPartitionFields
   *          the number of fields for map-reduce partitioning. This is usually
   *          the number of fields in the Group By keys.
   * @return the new ReduceSinkOperator.
   * @throws SemanticException
   */
  @SuppressWarnings("nls")
  private ReduceSinkOperator genGroupByPlanReduceSinkOperator(QB qb,
      String dest,
      Operator inputOperatorInfo,
      List grpByExprs,
      int numPartitionFields,
      boolean changeNumPartitionFields,
      int numReducers,
      boolean mapAggrDone,
      boolean groupingSetsPresent) throws SemanticException {

    RowResolver reduceSinkInputRowResolver = opParseCtx.get(inputOperatorInfo)
        .getRowResolver();
    QBParseInfo parseInfo = qb.getParseInfo();
    RowResolver reduceSinkOutputRowResolver = new RowResolver();
    reduceSinkOutputRowResolver.setIsExprResolver(true);
    Map colExprMap = new HashMap();
    // Pre-compute group-by keys and store in reduceKeys

    List outputKeyColumnNames = new ArrayList();
    List outputValueColumnNames = new ArrayList();

    ArrayList reduceKeys = getReduceKeysForReduceSink(grpByExprs, dest,
        reduceSinkInputRowResolver, reduceSinkOutputRowResolver, outputKeyColumnNames,
        colExprMap);

    int keyLength = reduceKeys.size();
    int numOfColsRmedFromkey = grpByExprs.size() - keyLength;

    // add a key for reduce sink
    if (groupingSetsPresent) {
      // Process grouping set for the reduce sink operator
      processGroupingSetReduceSinkOperator(
          reduceSinkInputRowResolver,
          reduceSinkOutputRowResolver,
          reduceKeys,
          outputKeyColumnNames,
          colExprMap);

      if (changeNumPartitionFields) {
        numPartitionFields++;
      }
    }

    List> distinctColIndices = getDistinctColIndicesForReduceSink(parseInfo, dest,
        reduceKeys, reduceSinkInputRowResolver, reduceSinkOutputRowResolver, outputKeyColumnNames,
        colExprMap);

    ArrayList reduceValues = new ArrayList();
    HashMap aggregationTrees = parseInfo
        .getAggregationExprsForClause(dest);

    if (!mapAggrDone) {
      getReduceValuesForReduceSinkNoMapAgg(parseInfo, dest, reduceSinkInputRowResolver,
          reduceSinkOutputRowResolver, outputValueColumnNames, reduceValues, colExprMap);
    } else {
      // Put partial aggregation results in reduceValues
      int inputField = reduceKeys.size() + numOfColsRmedFromkey;

      for (Map.Entry entry : aggregationTrees.entrySet()) {

        TypeInfo type = reduceSinkInputRowResolver.getColumnInfos().get(
            inputField).getType();
        ExprNodeColumnDesc exprDesc = new ExprNodeColumnDesc(type,
            getColumnInternalName(inputField), "", false);
        reduceValues.add(exprDesc);
        inputField++;
        String outputColName = getColumnInternalName(reduceValues.size() - 1);
        outputValueColumnNames.add(outputColName);
        String internalName = Utilities.ReduceField.VALUE.toString() + "."
            + outputColName;
        reduceSinkOutputRowResolver.putExpression(entry.getValue(),
            new ColumnInfo(internalName, type, null, false));
        colExprMap.put(internalName, exprDesc);
      }
    }

    ReduceSinkOperator rsOp = (ReduceSinkOperator) putOpInsertMap(
        OperatorFactory.getAndMakeChild(
            PlanUtils.getReduceSinkDesc(reduceKeys,
                groupingSetsPresent ? keyLength + 1 : keyLength,
                reduceValues, distinctColIndices,
                outputKeyColumnNames, outputValueColumnNames, true, -1, numPartitionFields,
                numReducers, AcidUtils.Operation.NOT_ACID),
            new RowSchema(reduceSinkOutputRowResolver.getColumnInfos()), inputOperatorInfo),
        reduceSinkOutputRowResolver);
    rsOp.setColumnExprMap(colExprMap);
    return rsOp;
  }

  private ArrayList getReduceKeysForReduceSink(List grpByExprs, String dest,
      RowResolver reduceSinkInputRowResolver, RowResolver reduceSinkOutputRowResolver,
      List outputKeyColumnNames, Map colExprMap)
      throws SemanticException {

    ArrayList reduceKeys = new ArrayList();

    for (int i = 0; i < grpByExprs.size(); ++i) {
      ASTNode grpbyExpr = grpByExprs.get(i);
      ExprNodeDesc inputExpr = genExprNodeDesc(grpbyExpr,
          reduceSinkInputRowResolver);
      ColumnInfo prev = reduceSinkOutputRowResolver.getExpression(grpbyExpr);
      if (prev != null && isDeterministic(inputExpr)) {
        colExprMap.put(prev.getInternalName(), inputExpr);
        continue;
      }
      reduceKeys.add(inputExpr);
      outputKeyColumnNames.add(getColumnInternalName(reduceKeys.size() - 1));
      String field = Utilities.ReduceField.KEY.toString() + "."
          + getColumnInternalName(reduceKeys.size() - 1);
      ColumnInfo colInfo = new ColumnInfo(field, reduceKeys.get(
          reduceKeys.size() - 1).getTypeInfo(), null, false);
      reduceSinkOutputRowResolver.putExpression(grpbyExpr, colInfo);
      colExprMap.put(colInfo.getInternalName(), inputExpr);
    }

    return reduceKeys;
  }

  private boolean isDeterministic(ExprNodeDesc expr) throws SemanticException {
    try {
      return ExprNodeEvaluatorFactory.get(expr).isDeterministic();
    } catch (Exception e) {
      throw new SemanticException(e);
    }
  }

  private List> getDistinctColIndicesForReduceSink(QBParseInfo parseInfo,
      String dest,
      List reduceKeys, RowResolver reduceSinkInputRowResolver,
      RowResolver reduceSinkOutputRowResolver, List outputKeyColumnNames,
      Map colExprMap)
      throws SemanticException {

    List> distinctColIndices = new ArrayList>();

    // If there is a distinctFuncExp, add all parameters to the reduceKeys.
    if (!parseInfo.getDistinctFuncExprsForClause(dest).isEmpty()) {
      List distFuncs = parseInfo.getDistinctFuncExprsForClause(dest);
      String colName = getColumnInternalName(reduceKeys.size());
      outputKeyColumnNames.add(colName);
      for (int i = 0; i < distFuncs.size(); i++) {
        ASTNode value = distFuncs.get(i);
        int numExprs = 0;
        List distinctIndices = new ArrayList();
        // 0 is function name
        for (int j = 1; j < value.getChildCount(); j++) {
          ASTNode parameter = (ASTNode) value.getChild(j);
          ExprNodeDesc expr = genExprNodeDesc(parameter, reduceSinkInputRowResolver);
          // see if expr is already present in reduceKeys.
          // get index of expr in reduceKeys
          int ri;
          for (ri = 0; ri < reduceKeys.size(); ri++) {
            if (reduceKeys.get(ri).getExprString().equals(expr.getExprString())) {
              break;
            }
          }
          // add the expr to reduceKeys if it is not present
          if (ri == reduceKeys.size()) {
            String name = getColumnInternalName(numExprs);
            String field = Utilities.ReduceField.KEY.toString() + "." + colName
                + ":" + i
                + "." + name;
            ColumnInfo colInfo = new ColumnInfo(field, expr.getTypeInfo(), null, false);
            reduceSinkOutputRowResolver.putExpression(parameter, colInfo);
            colExprMap.put(field, expr);
            reduceKeys.add(expr);
          }
          // add the index of expr in reduceKeys to distinctIndices
          distinctIndices.add(ri);
          numExprs++;
        }
        distinctColIndices.add(distinctIndices);
      }
    }

    return distinctColIndices;
  }

  private void getReduceValuesForReduceSinkNoMapAgg(QBParseInfo parseInfo, String dest,
      RowResolver reduceSinkInputRowResolver, RowResolver reduceSinkOutputRowResolver,
      List outputValueColumnNames, ArrayList reduceValues,
      Map colExprMap) throws SemanticException {
    HashMap aggregationTrees = parseInfo
        .getAggregationExprsForClause(dest);

    // Put parameters to aggregations in reduceValues
    for (Map.Entry entry : aggregationTrees.entrySet()) {
      ASTNode value = entry.getValue();
      // 0 is function name
      for (int i = 1; i < value.getChildCount(); i++) {
        ASTNode parameter = (ASTNode) value.getChild(i);
        if (reduceSinkOutputRowResolver.getExpression(parameter) == null) {
          ExprNodeDesc exprDesc = genExprNodeDesc(parameter, reduceSinkInputRowResolver);
          reduceValues.add(exprDesc);
          outputValueColumnNames
              .add(getColumnInternalName(reduceValues.size() - 1));
          String field = Utilities.ReduceField.VALUE.toString() + "."
              + getColumnInternalName(reduceValues.size() - 1);
          reduceSinkOutputRowResolver.putExpression(parameter, new ColumnInfo(field,
              reduceValues.get(reduceValues.size() - 1).getTypeInfo(), null,
              false));
          colExprMap.put(field, exprDesc);
        }
      }
    }
  }

  @SuppressWarnings("nls")
  private ReduceSinkOperator genCommonGroupByPlanReduceSinkOperator(QB qb, List dests,
      Operator inputOperatorInfo) throws SemanticException {

    RowResolver reduceSinkInputRowResolver = opParseCtx.get(inputOperatorInfo)
        .getRowResolver();
    QBParseInfo parseInfo = qb.getParseInfo();
    RowResolver reduceSinkOutputRowResolver = new RowResolver();
    reduceSinkOutputRowResolver.setIsExprResolver(true);
    Map colExprMap = new HashMap();

    // The group by keys and distinct keys should be the same for all dests, so using the first
    // one to produce these will be the same as using any other.
    String dest = dests.get(0);

    // Pre-compute group-by keys and store in reduceKeys
    List outputKeyColumnNames = new ArrayList();
    List outputValueColumnNames = new ArrayList();
    List grpByExprs = getGroupByForClause(parseInfo, dest);

    ArrayList reduceKeys = getReduceKeysForReduceSink(grpByExprs, dest,
        reduceSinkInputRowResolver, reduceSinkOutputRowResolver, outputKeyColumnNames,
        colExprMap);

    int keyLength = reduceKeys.size();

    List> distinctColIndices = getDistinctColIndicesForReduceSink(parseInfo, dest,
        reduceKeys, reduceSinkInputRowResolver, reduceSinkOutputRowResolver, outputKeyColumnNames,
        colExprMap);

    ArrayList reduceValues = new ArrayList();

    // The dests can have different non-distinct aggregations, so we have to iterate over all of
    // them
    for (String destination : dests) {

      getReduceValuesForReduceSinkNoMapAgg(parseInfo, destination, reduceSinkInputRowResolver,
          reduceSinkOutputRowResolver, outputValueColumnNames, reduceValues, colExprMap);

      // Need to pass all of the columns used in the where clauses as reduce values
      ASTNode whereClause = parseInfo.getWhrForClause(destination);
      if (whereClause != null) {
        assert whereClause.getChildCount() == 1;
        ASTNode predicates = (ASTNode) whereClause.getChild(0);

        Map nodeOutputs =
            genAllExprNodeDesc(predicates, reduceSinkInputRowResolver);
        removeMappingForKeys(predicates, nodeOutputs, reduceKeys);

        // extract columns missing in current RS key/value
        for (Map.Entry entry : nodeOutputs.entrySet()) {
          ASTNode parameter = entry.getKey();
          ExprNodeDesc expression = entry.getValue();
          if (!(expression instanceof ExprNodeColumnDesc)) {
            continue;
          }
          if (ExprNodeDescUtils.indexOf(expression, reduceValues) >= 0) {
            continue;
          }
          String internalName = getColumnInternalName(reduceValues.size());
          String field = Utilities.ReduceField.VALUE.toString() + "." + internalName;

          reduceValues.add(expression);
          outputValueColumnNames.add(internalName);
          reduceSinkOutputRowResolver.putExpression(parameter,
              new ColumnInfo(field, expression.getTypeInfo(), null, false));
          colExprMap.put(field, expression);
        }
      }
    }

    // Optimize the scenario when there are no grouping keys - only 1 reducer is needed
    int numReducers = -1;
    if (grpByExprs.isEmpty()) {
      numReducers = 1;
    }
    ReduceSinkDesc rsDesc = PlanUtils.getReduceSinkDesc(reduceKeys, keyLength, reduceValues,
        distinctColIndices, outputKeyColumnNames, outputValueColumnNames,
        true, -1, keyLength, numReducers, AcidUtils.Operation.NOT_ACID);

    ReduceSinkOperator rsOp = (ReduceSinkOperator) putOpInsertMap(
        OperatorFactory.getAndMakeChild(rsDesc, new RowSchema(reduceSinkOutputRowResolver
            .getColumnInfos()), inputOperatorInfo), reduceSinkOutputRowResolver);
    rsOp.setColumnExprMap(colExprMap);
    return rsOp;
  }

  // Remove expression node descriptor and children of it for a given predicate
  // from mapping if it's already on RS keys.
  // Remaining column expressions would be a candidate for an RS value
  private void removeMappingForKeys(ASTNode predicate, Map mapping,
      List keys) {
    ExprNodeDesc expr = mapping.get(predicate);
    if (expr != null && ExprNodeDescUtils.indexOf(expr, keys) >= 0) {
      removeRecursively(predicate, mapping);
    } else {
      for (int i = 0; i < predicate.getChildCount(); i++) {
        removeMappingForKeys((ASTNode) predicate.getChild(i), mapping, keys);
      }
    }
  }

  // Remove expression node desc and all children of it from mapping
  private void removeRecursively(ASTNode current, Map mapping) {
    mapping.remove(current);
    for (int i = 0; i < current.getChildCount(); i++) {
      removeRecursively((ASTNode) current.getChild(i), mapping);
    }
  }

  /**
   * Generate the second ReduceSinkOperator for the Group By Plan
   * (parseInfo.getXXX(dest)). The new ReduceSinkOperator will be a child of
   * groupByOperatorInfo.
   *
   * The second ReduceSinkOperator will put the group by keys in the map-reduce
   * sort key, and put the partial aggregation results in the map-reduce value.
   *
   * @param numPartitionFields
   *          the number of fields in the map-reduce partition key. This should
   *          always be the same as the number of Group By keys. We should be
   *          able to remove this parameter since in this phase there is no
   *          distinct any more.
   * @return the new ReduceSinkOperator.
   * @throws SemanticException
   */
  @SuppressWarnings("nls")
  private Operator genGroupByPlanReduceSinkOperator2MR(QBParseInfo parseInfo,
      String dest,
      Operator groupByOperatorInfo,
      int numPartitionFields,
      int numReducers,
      boolean groupingSetsPresent) throws SemanticException {
    RowResolver reduceSinkInputRowResolver2 = opParseCtx.get(
        groupByOperatorInfo).getRowResolver();
    RowResolver reduceSinkOutputRowResolver2 = new RowResolver();
    reduceSinkOutputRowResolver2.setIsExprResolver(true);
    Map colExprMap = new HashMap();
    ArrayList reduceKeys = new ArrayList();
    ArrayList outputColumnNames = new ArrayList();
    // Get group-by keys and store in reduceKeys
    List grpByExprs = getGroupByForClause(parseInfo, dest);
    for (int i = 0; i < grpByExprs.size(); ++i) {
      ASTNode grpbyExpr = grpByExprs.get(i);
      String field = getColumnInternalName(i);
      outputColumnNames.add(field);
      TypeInfo typeInfo = reduceSinkInputRowResolver2.getExpression(
          grpbyExpr).getType();
      ExprNodeColumnDesc inputExpr = new ExprNodeColumnDesc(typeInfo, field,
          "", false);
      reduceKeys.add(inputExpr);
      ColumnInfo colInfo = new ColumnInfo(Utilities.ReduceField.KEY.toString()
          + "." + field, typeInfo, "", false);
      reduceSinkOutputRowResolver2.putExpression(grpbyExpr, colInfo);
      colExprMap.put(colInfo.getInternalName(), inputExpr);
    }

    // add a key for reduce sink
    if (groupingSetsPresent) {
      // Note that partitioning fields dont need to change, since it is either
      // partitioned randomly, or by all grouping keys + distinct keys
      processGroupingSetReduceSinkOperator(
          reduceSinkInputRowResolver2,
          reduceSinkOutputRowResolver2,
          reduceKeys,
          outputColumnNames,
          colExprMap);
    }

    // Get partial aggregation results and store in reduceValues
    ArrayList reduceValues = new ArrayList();
    int inputField = reduceKeys.size();
    HashMap aggregationTrees = parseInfo
        .getAggregationExprsForClause(dest);
    for (Map.Entry entry : aggregationTrees.entrySet()) {
      String field = getColumnInternalName(inputField);
      ASTNode t = entry.getValue();
      TypeInfo typeInfo = reduceSinkInputRowResolver2.getExpression(t)
          .getType();
      ExprNodeColumnDesc exprDesc = new ExprNodeColumnDesc(typeInfo, field, "", false);
      reduceValues.add(exprDesc);
      inputField++;
      String col = getColumnInternalName(reduceValues.size() - 1);
      outputColumnNames.add(col);
      reduceSinkOutputRowResolver2.putExpression(t, new ColumnInfo(
          Utilities.ReduceField.VALUE.toString() + "." + col, typeInfo, "",
          false));
      colExprMap.put(col, exprDesc);
    }

    ReduceSinkOperator rsOp = (ReduceSinkOperator) putOpInsertMap(
        OperatorFactory.getAndMakeChild(PlanUtils.getReduceSinkDesc(reduceKeys,
            reduceValues, outputColumnNames, true, -1, numPartitionFields,
            numReducers, AcidUtils.Operation.NOT_ACID),
            new RowSchema(reduceSinkOutputRowResolver2.getColumnInfos()), groupByOperatorInfo),
        reduceSinkOutputRowResolver2);

    rsOp.setColumnExprMap(colExprMap);
    return rsOp;
  }

  /**
   * Generate the second GroupByOperator for the Group By Plan
   * (parseInfo.getXXX(dest)). The new GroupByOperator will do the second
   * aggregation based on the partial aggregation results.
   *
   * @param mode
   *          the mode of aggregation (FINAL)
   * @param genericUDAFEvaluators
   *          The mapping from Aggregation StringTree to the
   *          genericUDAFEvaluator.
   * @return the new GroupByOperator
   * @throws SemanticException
   */
  @SuppressWarnings("nls")
  private Operator genGroupByPlanGroupByOperator2MR(QBParseInfo parseInfo,
      String dest,
      Operator reduceSinkOperatorInfo2,
      GroupByDesc.Mode mode,
      Map genericUDAFEvaluators,
      boolean groupingSetsPresent) throws SemanticException {

    RowResolver groupByInputRowResolver2 = opParseCtx.get(
        reduceSinkOperatorInfo2).getRowResolver();
    RowResolver groupByOutputRowResolver2 = new RowResolver();
    groupByOutputRowResolver2.setIsExprResolver(true);
    ArrayList groupByKeys = new ArrayList();
    ArrayList aggregations = new ArrayList();
    Map colExprMap = new HashMap();
    List grpByExprs = getGroupByForClause(parseInfo, dest);
    ArrayList outputColumnNames = new ArrayList();
    for (int i = 0; i < grpByExprs.size(); ++i) {
      ASTNode grpbyExpr = grpByExprs.get(i);
      ColumnInfo exprInfo = groupByInputRowResolver2.getExpression(grpbyExpr);
      if (exprInfo == null) {
        throw new SemanticException(ErrorMsg.INVALID_COLUMN.getMsg(grpbyExpr));
      }

      String expression = exprInfo.getInternalName();
      groupByKeys.add(new ExprNodeColumnDesc(exprInfo.getType(), expression,
          exprInfo.getTabAlias(), exprInfo.getIsVirtualCol()));
      String field = getColumnInternalName(i);
      outputColumnNames.add(field);
      ColumnInfo oColInfo = new ColumnInfo(field, exprInfo.getType(), "", false);
      groupByOutputRowResolver2.putExpression(grpbyExpr,
          oColInfo);
      addAlternateGByKeyMappings(grpbyExpr, oColInfo, reduceSinkOperatorInfo2, groupByOutputRowResolver2);
      colExprMap.put(field, groupByKeys.get(groupByKeys.size() - 1));
    }

    int groupingSetsPosition = -1;
    // For grouping sets, add a dummy grouping key
    if (groupingSetsPresent) {
      groupingSetsPosition = groupByKeys.size();
      addGroupingSetKey(
          groupByKeys,
          groupByInputRowResolver2,
          groupByOutputRowResolver2,
          outputColumnNames,
          colExprMap);
    }

    HashMap aggregationTrees = parseInfo
        .getAggregationExprsForClause(dest);
    boolean containsDistinctAggr = false;
    for (Map.Entry entry : aggregationTrees.entrySet()) {
      ArrayList aggParameters = new ArrayList();
      ASTNode value = entry.getValue();
      ColumnInfo paraExprInfo = groupByInputRowResolver2.getExpression(value);
      if (paraExprInfo == null) {
        throw new SemanticException(ErrorMsg.INVALID_COLUMN.getMsg(value));
      }
      String paraExpression = paraExprInfo.getInternalName();
      assert (paraExpression != null);
      aggParameters.add(new ExprNodeColumnDesc(paraExprInfo.getType(),
          paraExpression, paraExprInfo.getTabAlias(), paraExprInfo
              .getIsVirtualCol()));

      String aggName = unescapeIdentifier(value.getChild(0).getText());

      boolean isDistinct = value.getType() == HiveParser.TOK_FUNCTIONDI;
      containsDistinctAggr = containsDistinctAggr || isDistinct;
      boolean isStar = value.getType() == HiveParser.TOK_FUNCTIONSTAR;
      Mode amode = groupByDescModeToUDAFMode(mode, isDistinct);
      GenericUDAFEvaluator genericUDAFEvaluator = genericUDAFEvaluators
          .get(entry.getKey());
      assert (genericUDAFEvaluator != null);
      GenericUDAFInfo udaf = getGenericUDAFInfo(genericUDAFEvaluator, amode,
          aggParameters);
      aggregations
          .add(new AggregationDesc(
              aggName.toLowerCase(),
              udaf.genericUDAFEvaluator,
              udaf.convertedParameters,
              (mode != GroupByDesc.Mode.FINAL && value.getToken().getType() ==
              HiveParser.TOK_FUNCTIONDI),
              amode));
      String field = getColumnInternalName(groupByKeys.size()
          + aggregations.size() - 1);
      outputColumnNames.add(field);
      groupByOutputRowResolver2.putExpression(value, new ColumnInfo(
          field, udaf.returnType, "", false));
    }
    float groupByMemoryUsage = HiveConf.getFloatVar(conf, HiveConf.ConfVars.HIVEMAPAGGRHASHMEMORY);
    float memoryThreshold = HiveConf
        .getFloatVar(conf, HiveConf.ConfVars.HIVEMAPAGGRMEMORYTHRESHOLD);

    Operator op = putOpInsertMap(OperatorFactory.getAndMakeChild(
        new GroupByDesc(mode, outputColumnNames, groupByKeys, aggregations,
            false, groupByMemoryUsage, memoryThreshold, null, false,
            groupingSetsPosition, containsDistinctAggr),
        new RowSchema(groupByOutputRowResolver2.getColumnInfos()),
        reduceSinkOperatorInfo2), groupByOutputRowResolver2);
    op.setColumnExprMap(colExprMap);
    return op;
  }

  /**
   * Generate a Group-By plan using a single map-reduce job (3 operators will be
   * inserted):
   *
   * ReduceSink ( keys = (K1_EXP, K2_EXP, DISTINCT_EXP), values = (A1_EXP,
   * A2_EXP) ) SortGroupBy (keys = (KEY.0,KEY.1), aggregations =
   * (count_distinct(KEY.2), sum(VALUE.0), count(VALUE.1))) Select (final
   * selects).
   *
   * @param dest
   * @param qb
   * @param input
   * @return
   * @throws SemanticException
   *
   *           Generate a Group-By plan using 1 map-reduce job. Spray by the
   *           group by key, and sort by the distinct key (if any), and compute
   *           aggregates * The aggregation evaluation functions are as
   *           follows: Partitioning Key: grouping key
   *
   *           Sorting Key: grouping key if no DISTINCT grouping + distinct key
   *           if DISTINCT
   *
   *           Reducer: iterate/merge (mode = COMPLETE)
   **/
  @SuppressWarnings({"nls"})
  private Operator genGroupByPlan1MR(String dest, QB qb, Operator input)
      throws SemanticException {

    QBParseInfo parseInfo = qb.getParseInfo();

    int numReducers = -1;
    ObjectPair, List> grpByExprsGroupingSets =
        getGroupByGroupingSetsForClause(parseInfo, dest);

    List grpByExprs = grpByExprsGroupingSets.getFirst();
    List groupingSets = grpByExprsGroupingSets.getSecond();

    if (grpByExprs.isEmpty()) {
      numReducers = 1;
    }

    // Grouping sets are not allowed
    if (!groupingSets.isEmpty()) {
      throw new SemanticException(ErrorMsg.HIVE_GROUPING_SETS_AGGR_NOMAPAGGR.getMsg());
    }

    // ////// 1. Generate ReduceSinkOperator
    ReduceSinkOperator reduceSinkOperatorInfo =
        genGroupByPlanReduceSinkOperator(qb,
            dest,
            input,
            grpByExprs,
            grpByExprs.size(),
            false,
            numReducers,
            false,
            false);

    // ////// 2. Generate GroupbyOperator
    Operator groupByOperatorInfo = genGroupByPlanGroupByOperator(parseInfo,
        dest, reduceSinkOperatorInfo, reduceSinkOperatorInfo, GroupByDesc.Mode.COMPLETE, null);

    return groupByOperatorInfo;
  }

  @SuppressWarnings({"nls"})
  private Operator genGroupByPlan1ReduceMultiGBY(List dests, QB qb, Operator input,
      Map aliasToOpInfo)
      throws SemanticException {

    QBParseInfo parseInfo = qb.getParseInfo();

    ExprNodeDesc previous = null;
    Operator selectInput = input;

    // In order to facilitate partition pruning, or the where clauses together and put them at the
    // top of the operator tree, this could also reduce the amount of data going to the reducer
    List whereExpressions =
        new ArrayList();
    for (String dest : dests) {
      ObjectPair, List> grpByExprsGroupingSets =
          getGroupByGroupingSetsForClause(parseInfo, dest);

      List groupingSets = grpByExprsGroupingSets.getSecond();
      if (!groupingSets.isEmpty()) {
        throw new SemanticException(ErrorMsg.HIVE_GROUPING_SETS_AGGR_NOMAPAGGR_MULTIGBY.getMsg());
      }

      ASTNode whereExpr = parseInfo.getWhrForClause(dest);

      if (whereExpr != null) {
        OpParseContext inputCtx = opParseCtx.get(input);
        RowResolver inputRR = inputCtx.getRowResolver();
        ExprNodeDesc current = genExprNodeDesc((ASTNode) whereExpr.getChild(0), inputRR);

        // Check the list of where expressions already added so they aren't duplicated
        ExprNodeDesc.ExprNodeDescEqualityWrapper currentWrapped =
            new ExprNodeDesc.ExprNodeDescEqualityWrapper(current);
        if (!whereExpressions.contains(currentWrapped)) {
          whereExpressions.add(currentWrapped);
        } else {
          continue;
        }

        if (previous == null) {
          // If this is the first expression
          previous = current;
          continue;
        }

        GenericUDFOPOr or = new GenericUDFOPOr();
        List expressions = new ArrayList(2);
        expressions.add(current);
        expressions.add(previous);
        ExprNodeDesc orExpr =
            new ExprNodeGenericFuncDesc(TypeInfoFactory.booleanTypeInfo, or, expressions);
        previous = orExpr;
      } else {
        // If an expression does not have a where clause, there can be no common filter
        previous = null;
        break;
      }
    }

    if (previous != null) {
      OpParseContext inputCtx = opParseCtx.get(input);
      RowResolver inputRR = inputCtx.getRowResolver();
      FilterDesc orFilterDesc = new FilterDesc(previous, false);
      orFilterDesc.setGenerated(true);

      selectInput = putOpInsertMap(OperatorFactory.getAndMakeChild(orFilterDesc, new RowSchema(
              inputRR.getColumnInfos()), input), inputRR);
    }

    // insert a select operator here used by the ColumnPruner to reduce
    // the data to shuffle
    Operator select = genSelectAllDesc(selectInput);

    // Generate ReduceSinkOperator
    ReduceSinkOperator reduceSinkOperatorInfo =
        genCommonGroupByPlanReduceSinkOperator(qb, dests, select);

    // It is assumed throughout the code that a reducer has a single child, add a
    // ForwardOperator so that we can add multiple filter/group by operators as children
    RowResolver reduceSinkOperatorInfoRR = opParseCtx.get(reduceSinkOperatorInfo).getRowResolver();
    Operator forwardOp = putOpInsertMap(OperatorFactory.getAndMakeChild(new ForwardDesc(),
        new RowSchema(reduceSinkOperatorInfoRR.getColumnInfos()), reduceSinkOperatorInfo),
        reduceSinkOperatorInfoRR);

    Operator curr = forwardOp;

    for (String dest : dests) {
      curr = forwardOp;

      if (parseInfo.getWhrForClause(dest) != null) {
        ASTNode whereExpr = qb.getParseInfo().getWhrForClause(dest);
        curr = genFilterPlan((ASTNode) whereExpr.getChild(0), qb, forwardOp, aliasToOpInfo, false, true);
      }

      // Generate GroupbyOperator
      Operator groupByOperatorInfo = genGroupByPlanGroupByOperator(parseInfo,
          dest, curr, reduceSinkOperatorInfo, GroupByDesc.Mode.COMPLETE, null);

      // TODO: should we pass curr instead of null?
      curr = genPostGroupByBodyPlan(groupByOperatorInfo, dest, qb, aliasToOpInfo, null);
    }

    return curr;
  }

  static ArrayList getUDAFEvaluators(
      ArrayList aggs) {
    ArrayList result = new ArrayList();
    for (int i = 0; i < aggs.size(); i++) {
      result.add(aggs.get(i).getGenericUDAFEvaluator());
    }
    return result;
  }

  /**
   * Generate a Group-By plan using a 2 map-reduce jobs (5 operators will be
   * inserted):
   *
   * ReduceSink ( keys = (K1_EXP, K2_EXP, DISTINCT_EXP), values = (A1_EXP,
   * A2_EXP) ) NOTE: If DISTINCT_EXP is null, partition by rand() SortGroupBy
   * (keys = (KEY.0,KEY.1), aggregations = (count_distinct(KEY.2), sum(VALUE.0),
   * count(VALUE.1))) ReduceSink ( keys = (0,1), values=(2,3,4)) SortGroupBy
   * (keys = (KEY.0,KEY.1), aggregations = (sum(VALUE.0), sum(VALUE.1),
   * sum(VALUE.2))) Select (final selects).
   *
   * @param dest
   * @param qb
   * @param input
   * @return
   * @throws SemanticException
   *
   *           Generate a Group-By plan using a 2 map-reduce jobs. Spray by the
   *           grouping key and distinct key (or a random number, if no distinct
   *           is present) in hope of getting a uniform distribution, and
   *           compute partial aggregates grouped by the reduction key (grouping
   *           key + distinct key). Evaluate partial aggregates first, and spray
   *           by the grouping key to compute actual aggregates in the second
   *           phase. The aggregation evaluation functions are as follows:
   *           Partitioning Key: random() if no DISTINCT grouping + distinct key
   *           if DISTINCT
   *
   *           Sorting Key: grouping key if no DISTINCT grouping + distinct key
   *           if DISTINCT
   *
   *           Reducer: iterate/terminatePartial (mode = PARTIAL1)
   *
   *           STAGE 2
   *
   *           Partitioning Key: grouping key
   *
   *           Sorting Key: grouping key if no DISTINCT grouping + distinct key
   *           if DISTINCT
   *
   *           Reducer: merge/terminate (mode = FINAL)
   */
  @SuppressWarnings("nls")
  private Operator genGroupByPlan2MR(String dest, QB qb, Operator input)
      throws SemanticException {

    QBParseInfo parseInfo = qb.getParseInfo();

    ObjectPair, List> grpByExprsGroupingSets =
        getGroupByGroupingSetsForClause(parseInfo, dest);

    List grpByExprs = grpByExprsGroupingSets.getFirst();
    List groupingSets = grpByExprsGroupingSets.getSecond();

    // Grouping sets are not allowed
    // This restriction can be lifted in future.
    // HIVE-3508 has been filed for this
    if (!groupingSets.isEmpty()) {
      throw new SemanticException(ErrorMsg.HIVE_GROUPING_SETS_AGGR_NOMAPAGGR.getMsg());
    }

    // ////// 1. Generate ReduceSinkOperator
    // There is a special case when we want the rows to be randomly distributed
    // to
    // reducers for load balancing problem. That happens when there is no
    // DISTINCT
    // operator. We set the numPartitionColumns to -1 for this purpose. This is
    // captured by WritableComparableHiveObject.hashCode() function.
    ReduceSinkOperator reduceSinkOperatorInfo =
        genGroupByPlanReduceSinkOperator(qb,
            dest,
            input,
            grpByExprs,
            (parseInfo.getDistinctFuncExprsForClause(dest).isEmpty() ? -1 : Integer.MAX_VALUE),
            false,
            -1,
            false,
            false);

    // ////// 2. Generate GroupbyOperator
    Map genericUDAFEvaluators =
        new LinkedHashMap();
    GroupByOperator groupByOperatorInfo = (GroupByOperator) genGroupByPlanGroupByOperator(
        parseInfo, dest, reduceSinkOperatorInfo, reduceSinkOperatorInfo, GroupByDesc.Mode.PARTIAL1,
        genericUDAFEvaluators);

    int numReducers = -1;
    if (grpByExprs.isEmpty()) {
      numReducers = 1;
    }

    // ////// 3. Generate ReduceSinkOperator2
    Operator reduceSinkOperatorInfo2 = genGroupByPlanReduceSinkOperator2MR(
        parseInfo, dest, groupByOperatorInfo, grpByExprs.size(), numReducers, false);

    // ////// 4. Generate GroupbyOperator2
    Operator groupByOperatorInfo2 = genGroupByPlanGroupByOperator2MR(parseInfo,
        dest, reduceSinkOperatorInfo2, GroupByDesc.Mode.FINAL,
        genericUDAFEvaluators, false);

    return groupByOperatorInfo2;
  }

  private boolean optimizeMapAggrGroupBy(String dest, QB qb) throws SemanticException {
    List grpByExprs = getGroupByForClause(qb.getParseInfo(), dest);
    if ((grpByExprs != null) && !grpByExprs.isEmpty()) {
      return false;
    }

    if (!qb.getParseInfo().getDistinctFuncExprsForClause(dest).isEmpty()) {
      return false;
    }

    return true;
  }

  static private void extractColumns(Set colNamesExprs,
      ExprNodeDesc exprNode) throws SemanticException {
    if (exprNode instanceof ExprNodeColumnDesc) {
      colNamesExprs.add(((ExprNodeColumnDesc) exprNode).getColumn());
      return;
    }

    if (exprNode instanceof ExprNodeGenericFuncDesc) {
      ExprNodeGenericFuncDesc funcDesc = (ExprNodeGenericFuncDesc) exprNode;
      for (ExprNodeDesc childExpr : funcDesc.getChildren()) {
        extractColumns(colNamesExprs, childExpr);
      }
    }
  }

  static private boolean hasCommonElement(Set set1, Set set2) {
    for (String elem1 : set1) {
      if (set2.contains(elem1)) {
        return true;
      }
    }

    return false;
  }

  void checkExpressionsForGroupingSet(List grpByExprs,
      List distinctGrpByExprs,
      Map aggregationTrees,
      RowResolver inputRowResolver) throws SemanticException {

    Set colNamesGroupByExprs = new HashSet();
    Set colNamesGroupByDistinctExprs = new HashSet();
    Set colNamesAggregateParameters = new HashSet();

    // The columns in the group by expressions should not intersect with the columns in the
    // distinct expressions
    for (ASTNode grpByExpr : grpByExprs) {
      extractColumns(colNamesGroupByExprs, genExprNodeDesc(grpByExpr, inputRowResolver));
    }

    // If there is a distinctFuncExp, add all parameters to the reduceKeys.
    if (!distinctGrpByExprs.isEmpty()) {
      for (ASTNode value : distinctGrpByExprs) {
        // 0 is function name
        for (int i = 1; i < value.getChildCount(); i++) {
          ASTNode parameter = (ASTNode) value.getChild(i);
          ExprNodeDesc distExprNode = genExprNodeDesc(parameter, inputRowResolver);
          // extract all the columns
          extractColumns(colNamesGroupByDistinctExprs, distExprNode);
        }

        if (hasCommonElement(colNamesGroupByExprs, colNamesGroupByDistinctExprs)) {
          throw new SemanticException(ErrorMsg.HIVE_GROUPING_SETS_AGGR_EXPRESSION_INVALID.getMsg());
        }
      }
    }

    for (Map.Entry entry : aggregationTrees.entrySet()) {
      ASTNode value = entry.getValue();
      ArrayList aggParameters = new ArrayList();
      // 0 is the function name
      for (int i = 1; i < value.getChildCount(); i++) {
        ASTNode paraExpr = (ASTNode) value.getChild(i);
        ExprNodeDesc paraExprNode = genExprNodeDesc(paraExpr, inputRowResolver);

        // extract all the columns
        extractColumns(colNamesAggregateParameters, paraExprNode);
      }

      if (hasCommonElement(colNamesGroupByExprs, colNamesAggregateParameters)) {
        throw new SemanticException(ErrorMsg.HIVE_GROUPING_SETS_AGGR_EXPRESSION_INVALID.getMsg());
      }
    }
  }

  /**
   * Generate a Group-By plan using 1 map-reduce job. First perform a map-side
   * partial aggregation (to reduce the amount of data), at this point of time,
   * we may turn off map-side partial aggregation based on its performance. Then
   * spray by the group by key, and sort by the distinct key (if any), and
   * compute aggregates based on actual aggregates
   *
   * The aggregation evaluation functions are as follows:
   *
   * No grouping sets:
   * Group By Operator:
   * grouping keys: group by expressions if no DISTINCT
   * grouping keys: group by expressions + distinct keys if DISTINCT
   * Mapper: iterate/terminatePartial (mode = HASH)
   * Partitioning Key: grouping key
   * Sorting Key: grouping key if no DISTINCT
   * grouping + distinct key if DISTINCT
   * Reducer: iterate/terminate if DISTINCT
   * merge/terminate if NO DISTINCT (mode MERGEPARTIAL)
   *
   * Grouping Sets:
   * Group By Operator:
   * grouping keys: group by expressions + grouping id. if no DISTINCT
   * grouping keys: group by expressions + grouping id. + distinct keys if DISTINCT
   * Mapper: iterate/terminatePartial (mode = HASH)
   * Partitioning Key: grouping key + grouping id.
   * Sorting Key: grouping key + grouping id. if no DISTINCT
   * grouping + grouping id. + distinct key if DISTINCT
   * Reducer: iterate/terminate if DISTINCT
   * merge/terminate if NO DISTINCT (mode MERGEPARTIAL)
   *
   * Grouping Sets with an additional MR job introduced (distincts are not allowed):
   * Group By Operator:
   * grouping keys: group by expressions
   * Mapper: iterate/terminatePartial (mode = HASH)
   * Partitioning Key: grouping key
   * Sorting Key: grouping key
   * Reducer: merge/terminate (mode MERGEPARTIAL)
   * Group by Operator:
   * grouping keys: group by expressions + add a new grouping id. key
   *
   * STAGE 2
   * Partitioning Key: grouping key + grouping id.
   * Sorting Key: grouping key + grouping id.
   * Reducer: merge/terminate (mode = FINAL)
   * Group by Operator:
   * grouping keys: group by expressions + grouping id.
   */
  @SuppressWarnings("nls")
  private Operator genGroupByPlanMapAggrNoSkew(String dest, QB qb,
      Operator inputOperatorInfo) throws SemanticException {

    QBParseInfo parseInfo = qb.getParseInfo();
    ObjectPair, List> grpByExprsGroupingSets =
        getGroupByGroupingSetsForClause(parseInfo, dest);

    List grpByExprs = grpByExprsGroupingSets.getFirst();
    List groupingSets = grpByExprsGroupingSets.getSecond();
    boolean groupingSetsPresent = !groupingSets.isEmpty();

    int newMRJobGroupingSetsThreshold =
        conf.getIntVar(HiveConf.ConfVars.HIVE_NEW_JOB_GROUPING_SET_CARDINALITY);

    if (groupingSetsPresent) {
      checkExpressionsForGroupingSet(grpByExprs,
          parseInfo.getDistinctFuncExprsForClause(dest),
          parseInfo.getAggregationExprsForClause(dest),
          opParseCtx.get(inputOperatorInfo).getRowResolver());
    }

    // ////// Generate GroupbyOperator for a map-side partial aggregation
    Map genericUDAFEvaluators =
        new LinkedHashMap();

    // Is the grouping sets data consumed in the current in MR job, or
    // does it need an additional MR job
    boolean groupingSetsNeedAdditionalMRJob =
        groupingSetsPresent && groupingSets.size() > newMRJobGroupingSetsThreshold ?
            true : false;

    GroupByOperator groupByOperatorInfo =
        (GroupByOperator) genGroupByPlanMapGroupByOperator(
            qb,
            dest,
            grpByExprs,
            inputOperatorInfo,
            GroupByDesc.Mode.HASH,
            genericUDAFEvaluators,
            groupingSets,
            groupingSetsPresent && !groupingSetsNeedAdditionalMRJob);

    groupOpToInputTables.put(groupByOperatorInfo, opParseCtx.get(
        inputOperatorInfo).getRowResolver().getTableNames());
    int numReducers = -1;

    // Optimize the scenario when there are no grouping keys - only 1 reducer is
    // needed
    if (grpByExprs.isEmpty()) {
      numReducers = 1;
    }

    // ////// Generate ReduceSink Operator
    boolean isDistinct = !qb.getParseInfo().getDistinctFuncExprsForClause(dest).isEmpty();

    // Distincts are not allowed with an additional mr job
    if (groupingSetsNeedAdditionalMRJob && isDistinct) {
      String errorMsg = "The number of rows per input row due to grouping sets is "
          + groupingSets.size();
      throw new SemanticException(
          ErrorMsg.HIVE_GROUPING_SETS_THRESHOLD_NOT_ALLOWED_WITH_DISTINCTS.getMsg(errorMsg));
    }

    Operator reduceSinkOperatorInfo =
        genGroupByPlanReduceSinkOperator(qb,
            dest,
            groupByOperatorInfo,
            grpByExprs,
            grpByExprs.size(),
            true,
            numReducers,
            true,
            groupingSetsPresent && !groupingSetsNeedAdditionalMRJob);

    // Does it require a new MR job for grouping sets
    if (!groupingSetsPresent || !groupingSetsNeedAdditionalMRJob) {
      // This is a 1-stage map-reduce processing of the groupby. Tha map-side
      // aggregates was just used to
      // reduce output data. In case of distincts, partial results are not used,
      // and so iterate is again
      // invoked on the reducer. In case of non-distincts, partial results are
      // used, and merge is invoked
      // on the reducer.
      return genGroupByPlanGroupByOperator1(parseInfo, dest,
          reduceSinkOperatorInfo, GroupByDesc.Mode.MERGEPARTIAL,
          genericUDAFEvaluators,
          groupingSets, groupingSetsPresent, groupingSetsNeedAdditionalMRJob);
    }
    else
    {
      // Add 'n' rows corresponding to the grouping sets. For each row, create 'n' rows,
      // one for each grouping set key. Since map-side aggregation has already been performed,
      // the number of rows would have been reduced. Moreover, the rows corresponding to the
      // grouping keys come together, so there is a higher chance of finding the rows in the hash
      // table.
      Operator groupByOperatorInfo2 =
          genGroupByPlanGroupByOperator1(parseInfo, dest,
              reduceSinkOperatorInfo, GroupByDesc.Mode.PARTIALS,
              genericUDAFEvaluators,
              groupingSets, groupingSetsPresent, groupingSetsNeedAdditionalMRJob);

      // ////// Generate ReduceSinkOperator2
      Operator reduceSinkOperatorInfo2 = genGroupByPlanReduceSinkOperator2MR(
          parseInfo, dest, groupByOperatorInfo2, grpByExprs.size() + 1, numReducers,
          groupingSetsPresent);

      // ////// Generate GroupbyOperator3
      return genGroupByPlanGroupByOperator2MR(parseInfo, dest,
          reduceSinkOperatorInfo2, GroupByDesc.Mode.FINAL,
          genericUDAFEvaluators, groupingSetsPresent);
    }
  }

  /**
   * Generate a Group-By plan using a 2 map-reduce jobs. However, only 1
   * group-by plan is generated if the query involves no grouping key and no
   * distincts. In that case, the plan is same as generated by
   * genGroupByPlanMapAggr1MR. Otherwise, the following plan is generated: First
   * perform a map side partial aggregation (to reduce the amount of data). Then
   * spray by the grouping key and distinct key (or a random number, if no
   * distinct is present) in hope of getting a uniform distribution, and compute
   * partial aggregates grouped by the reduction key (grouping key + distinct
   * key). Evaluate partial aggregates first, and spray by the grouping key to
   * compute actual aggregates in the second phase.
   *
   * The aggregation evaluation functions are as follows:
   *
   * No grouping sets:
   * STAGE 1
   * Group by Operator:
   * grouping keys: group by expressions if no DISTINCT
   * grouping keys: group by expressions + distinct keys if DISTINCT
   * Mapper: iterate/terminatePartial (mode = HASH)
   * Partitioning Key: random() if no DISTINCT
   * grouping + distinct key if DISTINCT
   * Sorting Key: grouping key if no DISTINCT
   * grouping + distinct key if DISTINCT
   * Reducer: iterate/terminatePartial if DISTINCT
   * merge/terminatePartial if NO DISTINCT (mode = MERGEPARTIAL)
   * Group by Operator:
   * grouping keys: group by expressions
   *
   * STAGE 2
   * Partitioning Key: grouping key
   * Sorting Key: grouping key
   * Reducer: merge/terminate (mode = FINAL)
   *
   * In the presence of grouping sets, the aggregation evaluation functions are as follows:
   * STAGE 1
   * Group by Operator:
   * grouping keys: group by expressions + grouping id. if no DISTINCT
   * grouping keys: group by expressions + + grouping id. + distinct keys if DISTINCT
   * Mapper: iterate/terminatePartial (mode = HASH)
   * Partitioning Key: random() if no DISTINCT
   * grouping + grouping id. + distinct key if DISTINCT
   * Sorting Key: grouping key + grouping id. if no DISTINCT
   * grouping + grouping id. + distinct key if DISTINCT
   * Reducer: iterate/terminatePartial if DISTINCT
   * merge/terminatePartial if NO DISTINCT (mode = MERGEPARTIAL)
   * Group by Operator:
   * grouping keys: group by expressions + grouping id.
   *
   * STAGE 2
   * Partitioning Key: grouping key
   * Sorting Key: grouping key + grouping id.
   * Reducer: merge/terminate (mode = FINAL)
   */
  @SuppressWarnings("nls")
  private Operator genGroupByPlanMapAggr2MR(String dest, QB qb,
      Operator inputOperatorInfo) throws SemanticException {

    QBParseInfo parseInfo = qb.getParseInfo();

    ObjectPair, List> grpByExprsGroupingSets =
        getGroupByGroupingSetsForClause(parseInfo, dest);

    List grpByExprs = grpByExprsGroupingSets.getFirst();
    List groupingSets = grpByExprsGroupingSets.getSecond();
    boolean groupingSetsPresent = !groupingSets.isEmpty();

    if (groupingSetsPresent) {
      checkExpressionsForGroupingSet(grpByExprs,
          parseInfo.getDistinctFuncExprsForClause(dest),
          parseInfo.getAggregationExprsForClause(dest),
          opParseCtx.get(inputOperatorInfo).getRowResolver());

      int newMRJobGroupingSetsThreshold =
          conf.getIntVar(HiveConf.ConfVars.HIVE_NEW_JOB_GROUPING_SET_CARDINALITY);

      // Turn off skew if an additional MR job is required anyway for grouping sets.
      if (groupingSets.size() > newMRJobGroupingSetsThreshold) {
        String errorMsg = "The number of rows per input row due to grouping sets is "
            + groupingSets.size();
        throw new SemanticException(
            ErrorMsg.HIVE_GROUPING_SETS_THRESHOLD_NOT_ALLOWED_WITH_SKEW.getMsg(errorMsg));
      }
    }

    // ////// Generate GroupbyOperator for a map-side partial aggregation
    Map genericUDAFEvaluators =
        new LinkedHashMap();
    GroupByOperator groupByOperatorInfo =
        (GroupByOperator) genGroupByPlanMapGroupByOperator(
            qb, dest, grpByExprs, inputOperatorInfo, GroupByDesc.Mode.HASH,
            genericUDAFEvaluators, groupingSets, groupingSetsPresent);

    groupOpToInputTables.put(groupByOperatorInfo, opParseCtx.get(
        inputOperatorInfo).getRowResolver().getTableNames());
    // Optimize the scenario when there are no grouping keys and no distinct - 2
    // map-reduce jobs are not needed
    // For eg: select count(1) from T where t.ds = ....
    if (!optimizeMapAggrGroupBy(dest, qb)) {
      List distinctFuncExprs = parseInfo.getDistinctFuncExprsForClause(dest);

      // ////// Generate ReduceSink Operator
      Operator reduceSinkOperatorInfo =
          genGroupByPlanReduceSinkOperator(qb,
              dest,
              groupByOperatorInfo,
              grpByExprs,
              distinctFuncExprs.isEmpty() ? -1 : Integer.MAX_VALUE,
              false,
              -1,
              true,
              groupingSetsPresent);

      // ////// Generate GroupbyOperator for a partial aggregation
      Operator groupByOperatorInfo2 = genGroupByPlanGroupByOperator1(parseInfo,
          dest, reduceSinkOperatorInfo, GroupByDesc.Mode.PARTIALS,
          genericUDAFEvaluators,
          groupingSets, groupingSetsPresent, false);

      int numReducers = -1;
      if (grpByExprs.isEmpty()) {
        numReducers = 1;
      }

      // ////// Generate ReduceSinkOperator2
      Operator reduceSinkOperatorInfo2 = genGroupByPlanReduceSinkOperator2MR(
          parseInfo, dest, groupByOperatorInfo2, grpByExprs.size(), numReducers,
          groupingSetsPresent);

      // ////// Generate GroupbyOperator3
      return genGroupByPlanGroupByOperator2MR(parseInfo, dest,
          reduceSinkOperatorInfo2, GroupByDesc.Mode.FINAL,
          genericUDAFEvaluators, groupingSetsPresent);
    } else {
      // If there are no grouping keys, grouping sets cannot be present
      assert !groupingSetsPresent;

      // ////// Generate ReduceSink Operator
      Operator reduceSinkOperatorInfo =
          genGroupByPlanReduceSinkOperator(qb,
              dest,
              groupByOperatorInfo,
              grpByExprs,
              grpByExprs.size(),
              false,
              1,
              true,
              groupingSetsPresent);

      return genGroupByPlanGroupByOperator2MR(parseInfo, dest,
          reduceSinkOperatorInfo, GroupByDesc.Mode.FINAL, genericUDAFEvaluators, false);
    }
  }

  private int getReducersBucketing(int totalFiles, int maxReducers) {
    int numFiles = (int)Math.ceil((double)totalFiles / (double)maxReducers);
    while (true) {
      if (totalFiles % numFiles == 0) {
        return totalFiles / numFiles;
      }
      numFiles++;
    }
  }

  private static class SortBucketRSCtx {
    ArrayList partnCols;
    boolean multiFileSpray;
    int numFiles;
    int totalFiles;

    public SortBucketRSCtx() {
      partnCols = null;
      multiFileSpray = false;
      numFiles = 1;
      totalFiles = 1;
    }

    /**
     * @return the partnCols
     */
    public ArrayList getPartnCols() {
      return partnCols;
    }

    /**
     * @param partnCols
     *          the partnCols to set
     */
    public void setPartnCols(ArrayList partnCols) {
      this.partnCols = partnCols;
    }

    /**
     * @return the multiFileSpray
     */
    public boolean isMultiFileSpray() {
      return multiFileSpray;
    }

    /**
     * @param multiFileSpray
     *          the multiFileSpray to set
     */
    public void setMultiFileSpray(boolean multiFileSpray) {
      this.multiFileSpray = multiFileSpray;
    }

    /**
     * @return the numFiles
     */
    public int getNumFiles() {
      return numFiles;
    }

    /**
     * @param numFiles
     *          the numFiles to set
     */
    public void setNumFiles(int numFiles) {
      this.numFiles = numFiles;
    }

    /**
     * @return the totalFiles
     */
    public int getTotalFiles() {
      return totalFiles;
    }

    /**
     * @param totalFiles
     *          the totalFiles to set
     */
    public void setTotalFiles(int totalFiles) {
      this.totalFiles = totalFiles;
    }
  }

  @SuppressWarnings("nls")
  private Operator genBucketingSortingDest(String dest, Operator input, QB qb,
      TableDesc table_desc, Table dest_tab, SortBucketRSCtx ctx) throws SemanticException {

    // If the table is bucketed, and bucketing is enforced, do the following:
    // If the number of buckets is smaller than the number of maximum reducers,
    // create those many reducers.
    // If not, create a multiFileSink instead of FileSink - the multiFileSink will
    // spray the data into multiple buckets. That way, we can support a very large
    // number of buckets without needing a very large number of reducers.
    boolean enforceBucketing = false;
    ArrayList partnCols = new ArrayList();
    ArrayList sortCols = new ArrayList();
    ArrayList sortOrders = new ArrayList();
    ArrayList nullSortOrders = new ArrayList();
    boolean multiFileSpray = false;
    int numFiles = 1;
    int totalFiles = 1;

    if (dest_tab.getNumBuckets() > 0) {
      enforceBucketing = true;
      if (updating(dest) || deleting(dest)) {
        partnCols = getPartitionColsFromBucketColsForUpdateDelete(input, true);
      } else {
        partnCols = getPartitionColsFromBucketCols(dest, qb, dest_tab, table_desc, input, true);
      }
    }

    if ((dest_tab.getSortCols() != null) &&
        (dest_tab.getSortCols().size() > 0)) {
      sortCols = getSortCols(dest, qb, dest_tab, table_desc, input, true);
      sortOrders = getSortOrders(dest, qb, dest_tab, input);
      if (!enforceBucketing && !dest_tab.isIndexTable()) {
        throw new SemanticException(ErrorMsg.TBL_SORTED_NOT_BUCKETED.getErrorCodedMsg(dest_tab.getCompleteName()));
      } else {
        if (!enforceBucketing) {
          partnCols = sortCols;
        }
      }
      enforceBucketing = true;
    }

    if (enforceBucketing) {
      int maxReducers = conf.getIntVar(HiveConf.ConfVars.MAXREDUCERS);
      if (conf.getIntVar(HiveConf.ConfVars.HADOOPNUMREDUCERS) > 0) {
        maxReducers = conf.getIntVar(HiveConf.ConfVars.HADOOPNUMREDUCERS);
      }
      int numBuckets = dest_tab.getNumBuckets();
      if (numBuckets > maxReducers) {
        LOG.debug("numBuckets is {}", numBuckets, " and maxReducers is {}", maxReducers);
        multiFileSpray = true;
        totalFiles = numBuckets;
        if (totalFiles % maxReducers == 0) {
          numFiles = totalFiles / maxReducers;
        }
        else {
          // find the number of reducers such that it is a divisor of totalFiles
          maxReducers = getReducersBucketing(totalFiles, maxReducers);
          numFiles = totalFiles / maxReducers;
        }
      }
      else {
        maxReducers = numBuckets;
      }

      StringBuilder order = new StringBuilder();
      StringBuilder nullOrder = new StringBuilder();
      for (int sortOrder : sortOrders) {
        order.append(sortOrder == BaseSemanticAnalyzer.HIVE_COLUMN_ORDER_ASC ? '+' : '-');
        nullOrder.append(sortOrder == BaseSemanticAnalyzer.HIVE_COLUMN_ORDER_ASC ? 'a' : 'z');
      }
      input = genReduceSinkPlan(input, partnCols, sortCols, order.toString(), nullOrder.toString(),
              maxReducers, (AcidUtils.isAcidTable(dest_tab) ? getAcidType(dest) : AcidUtils.Operation.NOT_ACID));
      reduceSinkOperatorsAddedByEnforceBucketingSorting.add((ReduceSinkOperator)input.getParentOperators().get(0));
      ctx.setMultiFileSpray(multiFileSpray);
      ctx.setNumFiles(numFiles);
      ctx.setTotalFiles(totalFiles);
    }
    return input;
  }

  private void genPartnCols(String dest, Operator input, QB qb,
      TableDesc table_desc, Table dest_tab, SortBucketRSCtx ctx) throws SemanticException {
    boolean enforceBucketing = false;
    ArrayList partnColsNoConvert = new ArrayList();

    if ((dest_tab.getNumBuckets() > 0)) {
      enforceBucketing = true;
      if (updating(dest) || deleting(dest)) {
        partnColsNoConvert = getPartitionColsFromBucketColsForUpdateDelete(input, false);
      } else {
        partnColsNoConvert = getPartitionColsFromBucketCols(dest, qb, dest_tab, table_desc, input,
            false);
      }
    }

    if ((dest_tab.getSortCols() != null) &&
        (dest_tab.getSortCols().size() > 0)) {
      if (!enforceBucketing && !dest_tab.isIndexTable()) {
        throw new SemanticException(ErrorMsg.TBL_SORTED_NOT_BUCKETED.getErrorCodedMsg(dest_tab.getCompleteName()));
      }
      else {
        if(!enforceBucketing) {
          partnColsNoConvert = getSortCols(dest, qb, dest_tab, table_desc, input, false);
        }
      }
      enforceBucketing = true;
    }

    if (enforceBucketing) {
      ctx.setPartnCols(partnColsNoConvert);
    }
  }

  @SuppressWarnings("unchecked")
  private void setStatsForNonNativeTable(Table tab) throws SemanticException {
    String tableName = DDLSemanticAnalyzer.getDotName(new String[] { tab.getDbName(),
        tab.getTableName() });
    AlterTableDesc alterTblDesc = new AlterTableDesc(AlterTableTypes.DROPPROPS, null, false);
    HashMap mapProp = new HashMap<>();
    mapProp.put(StatsSetupConst.COLUMN_STATS_ACCURATE, null);
    alterTblDesc.setOldName(tableName);
    alterTblDesc.setProps(mapProp);
    alterTblDesc.setDropIfExists(true);
    this.rootTasks.add(TaskFactory.get(new DDLWork(getInputs(), getOutputs(), alterTblDesc), conf));
  }

  @SuppressWarnings("nls")
  protected Operator genFileSinkPlan(String dest, QB qb, Operator input)
      throws SemanticException {

    RowResolver inputRR = opParseCtx.get(input).getRowResolver();
    QBMetaData qbm = qb.getMetaData();
    Integer dest_type = qbm.getDestTypeForAlias(dest);

    Table dest_tab = null; // destination table if any
    boolean destTableIsAcid = false; // should the destination table be written to using ACID
    boolean destTableIsTemporary = false;
    boolean destTableIsMaterialization = false;
    Partition dest_part = null;// destination partition if any
    Path queryTmpdir = null; // the intermediate destination directory
    Path dest_path = null; // the final destination directory
    TableDesc table_desc = null;
    int currentTableId = 0;
    boolean isLocal = false;
    SortBucketRSCtx rsCtx = new SortBucketRSCtx();
    DynamicPartitionCtx dpCtx = null;
    LoadTableDesc ltd = null;
    ListBucketingCtx lbCtx = null;
    Map partSpec = null;

    switch (dest_type.intValue()) {
    case QBMetaData.DEST_TABLE: {

      dest_tab = qbm.getDestTableForAlias(dest);
      destTableIsAcid = AcidUtils.isAcidTable(dest_tab);
      destTableIsTemporary = dest_tab.isTemporary();

      // Is the user trying to insert into a external tables
      if ((!conf.getBoolVar(HiveConf.ConfVars.HIVE_INSERT_INTO_EXTERNAL_TABLES)) &&
          (dest_tab.getTableType().equals(TableType.EXTERNAL_TABLE))) {
        throw new SemanticException(
            ErrorMsg.INSERT_EXTERNAL_TABLE.getMsg(dest_tab.getTableName()));
      }

      partSpec = qbm.getPartSpecForAlias(dest);
      dest_path = dest_tab.getPath();

      // If the query here is an INSERT_INTO and the target is an immutable table,
      // verify that our destination is empty before proceeding
      if (dest_tab.isImmutable() &&
          qb.getParseInfo().isInsertIntoTable(dest_tab.getDbName(),dest_tab.getTableName())){
        try {
          FileSystem fs = dest_path.getFileSystem(conf);
          if (! MetaStoreUtils.isDirEmpty(fs,dest_path)){
            LOG.warn("Attempted write into an immutable table : "
                + dest_tab.getTableName() + " : " + dest_path);
            throw new SemanticException(
                ErrorMsg.INSERT_INTO_IMMUTABLE_TABLE.getMsg(dest_tab.getTableName()));
          }
        } catch (IOException ioe) {
            LOG.warn("Error while trying to determine if immutable table has any data : "
                + dest_tab.getTableName() + " : " + dest_path);
          throw new SemanticException(ErrorMsg.INSERT_INTO_IMMUTABLE_TABLE.getMsg(ioe.getMessage()));
        }
      }

      // check for partition
      List parts = dest_tab.getPartitionKeys();
      if (parts != null && parts.size() > 0) { // table is partitioned
        if (partSpec == null || partSpec.size() == 0) { // user did NOT specify partition
          throw new SemanticException(generateErrorMessage(
              qb.getParseInfo().getDestForClause(dest),
              ErrorMsg.NEED_PARTITION_ERROR.getMsg()));
        }
        dpCtx = qbm.getDPCtx(dest);
        if (dpCtx == null) {
          dest_tab.validatePartColumnNames(partSpec, false);
          dpCtx = new DynamicPartitionCtx(dest_tab, partSpec,
              conf.getVar(HiveConf.ConfVars.DEFAULTPARTITIONNAME),
              conf.getIntVar(HiveConf.ConfVars.DYNAMICPARTITIONMAXPARTSPERNODE));
          qbm.setDPCtx(dest, dpCtx);
        }

        if (!HiveConf.getBoolVar(conf, HiveConf.ConfVars.DYNAMICPARTITIONING)) { // allow DP
          throw new SemanticException(generateErrorMessage(
              qb.getParseInfo().getDestForClause(dest),
              ErrorMsg.DYNAMIC_PARTITION_DISABLED.getMsg()));
        }
        if (dpCtx.getSPPath() != null) {
          dest_path = new Path(dest_tab.getPath(), dpCtx.getSPPath());
        }
        if ((dest_tab.getNumBuckets() > 0)) {
          dpCtx.setNumBuckets(dest_tab.getNumBuckets());
        }
      }

      boolean isNonNativeTable = dest_tab.isNonNative();
      if (isNonNativeTable) {
        queryTmpdir = dest_path;
      } else {
        queryTmpdir = ctx.getTempDirForPath(dest_path, true);
      }
      if (dpCtx != null) {
        // set the root of the temporary path where dynamic partition columns will populate
        dpCtx.setRootPath(queryTmpdir);
      }
      // this table_desc does not contain the partitioning columns
      table_desc = Utilities.getTableDesc(dest_tab);

      // Add sorting/bucketing if needed
      input = genBucketingSortingDest(dest, input, qb, table_desc, dest_tab, rsCtx);

      idToTableNameMap.put(String.valueOf(destTableId), dest_tab.getTableName());
      currentTableId = destTableId;
      destTableId++;

      lbCtx = constructListBucketingCtx(dest_tab.getSkewedColNames(),
          dest_tab.getSkewedColValues(), dest_tab.getSkewedColValueLocationMaps(),
          dest_tab.isStoredAsSubDirectories(), conf);

      // Create the work for moving the table
      // NOTE: specify Dynamic partitions in dest_tab for WriteEntity
      if (!isNonNativeTable) {
        AcidUtils.Operation acidOp = AcidUtils.Operation.NOT_ACID;
        if (destTableIsAcid) {
          acidOp = getAcidType(table_desc.getOutputFileFormatClass(), dest);
          checkAcidConstraints(qb, table_desc, dest_tab);
        }
        ltd = new LoadTableDesc(queryTmpdir, table_desc, dpCtx, acidOp);
        ltd.setReplace(!qb.getParseInfo().isInsertIntoTable(dest_tab.getDbName(),
            dest_tab.getTableName()));
        ltd.setLbCtx(lbCtx);
        loadTableWork.add(ltd);
      } else {
        // This is a non-native table.
        // We need to set stats as inaccurate.
        setStatsForNonNativeTable(dest_tab);
        // true if it is insert overwrite.
        boolean overwrite = !qb.getParseInfo().isInsertIntoTable(
                String.format("%s.%s", dest_tab.getDbName(), dest_tab.getTableName()));
        createInsertDesc(dest_tab, overwrite);
      }

      WriteEntity output = null;

      // Here only register the whole table for post-exec hook if no DP present
      // in the case of DP, we will register WriteEntity in MoveTask when the
      // list of dynamically created partitions are known.
      if ((dpCtx == null || dpCtx.getNumDPCols() == 0)) {
        output = new WriteEntity(dest_tab,  determineWriteType(ltd, isNonNativeTable, dest));
        if (!outputs.add(output)) {
          throw new SemanticException(ErrorMsg.OUTPUT_SPECIFIED_MULTIPLE_TIMES
              .getMsg(dest_tab.getTableName()));
        }
      }
      if ((dpCtx != null) && (dpCtx.getNumDPCols() >= 0)) {
        // No static partition specified
        if (dpCtx.getNumSPCols() == 0) {
          output = new WriteEntity(dest_tab, determineWriteType(ltd, isNonNativeTable, dest), false);
          outputs.add(output);
          output.setDynamicPartitionWrite(true);
        }
        // part of the partition specified
        // Create a DummyPartition in this case. Since, the metastore does not store partial
        // partitions currently, we need to store dummy partitions
        else {
          try {
            String ppath = dpCtx.getSPPath();
            ppath = ppath.substring(0, ppath.length() - 1);
            DummyPartition p =
                new DummyPartition(dest_tab, dest_tab.getDbName()
                    + "@" + dest_tab.getTableName() + "@" + ppath,
                    partSpec);
            output = new WriteEntity(p, getWriteType(dest), false);
            output.setDynamicPartitionWrite(true);
            outputs.add(output);
          } catch (HiveException e) {
            throw new SemanticException(e.getMessage(), e);
          }
        }
      }

      ctx.getLoadTableOutputMap().put(ltd, output);
      break;
    }
    case QBMetaData.DEST_PARTITION: {

      dest_part = qbm.getDestPartitionForAlias(dest);
      dest_tab = dest_part.getTable();
      destTableIsAcid = AcidUtils.isAcidTable(dest_tab);
      if ((!conf.getBoolVar(HiveConf.ConfVars.HIVE_INSERT_INTO_EXTERNAL_TABLES)) &&
          dest_tab.getTableType().equals(TableType.EXTERNAL_TABLE)) {
        throw new SemanticException(
            ErrorMsg.INSERT_EXTERNAL_TABLE.getMsg(dest_tab.getTableName()));
      }

      Path tabPath = dest_tab.getPath();
      Path partPath = dest_part.getDataLocation();

      // If the query here is an INSERT_INTO and the target is an immutable table,
      // verify that our destination is empty before proceeding
      if (dest_tab.isImmutable() &&
          qb.getParseInfo().isInsertIntoTable(dest_tab.getDbName(),dest_tab.getTableName())){
        try {
          FileSystem fs = partPath.getFileSystem(conf);
          if (! MetaStoreUtils.isDirEmpty(fs,partPath)){
            LOG.warn("Attempted write into an immutable table partition : "
                + dest_tab.getTableName() + " : " + partPath);
            throw new SemanticException(
                ErrorMsg.INSERT_INTO_IMMUTABLE_TABLE.getMsg(dest_tab.getTableName()));
          }
        } catch (IOException ioe) {
            LOG.warn("Error while trying to determine if immutable table partition has any data : "
                + dest_tab.getTableName() + " : " + partPath);
          throw new SemanticException(ErrorMsg.INSERT_INTO_IMMUTABLE_TABLE.getMsg(ioe.getMessage()));
        }
      }

      // if the table is in a different dfs than the partition,
      // replace the partition's dfs with the table's dfs.
      dest_path = new Path(tabPath.toUri().getScheme(), tabPath.toUri()
          .getAuthority(), partPath.toUri().getPath());

      queryTmpdir = ctx.getTempDirForPath(dest_path, true);
      table_desc = Utilities.getTableDesc(dest_tab);

      // Add sorting/bucketing if needed
      input = genBucketingSortingDest(dest, input, qb, table_desc, dest_tab, rsCtx);

      idToTableNameMap.put(String.valueOf(destTableId), dest_tab.getTableName());
      currentTableId = destTableId;
      destTableId++;

      lbCtx = constructListBucketingCtx(dest_part.getSkewedColNames(),
          dest_part.getSkewedColValues(), dest_part.getSkewedColValueLocationMaps(),
          dest_part.isStoredAsSubDirectories(), conf);
      AcidUtils.Operation acidOp = AcidUtils.Operation.NOT_ACID;
      if (destTableIsAcid) {
        acidOp = getAcidType(table_desc.getOutputFileFormatClass(), dest);
        checkAcidConstraints(qb, table_desc, dest_tab);
      }
      ltd = new LoadTableDesc(queryTmpdir, table_desc, dest_part.getSpec(), acidOp);
      ltd.setReplace(!qb.getParseInfo().isInsertIntoTable(dest_tab.getDbName(),
          dest_tab.getTableName()));
      ltd.setLbCtx(lbCtx);

      loadTableWork.add(ltd);
      if (!outputs.add(new WriteEntity(dest_part,
        determineWriteType(ltd, dest_tab.isNonNative(), dest)))) {

        throw new SemanticException(ErrorMsg.OUTPUT_SPECIFIED_MULTIPLE_TIMES
            .getMsg(dest_tab.getTableName() + "@" + dest_part.getName()));
      }
      break;
    }
    case QBMetaData.DEST_LOCAL_FILE:
      isLocal = true;
      // fall through
    case QBMetaData.DEST_DFS_FILE: {
      dest_path = new Path(qbm.getDestFileForAlias(dest));

      if (isLocal) {
        // for local directory - we always write to map-red intermediate
        // store and then copy to local fs
        queryTmpdir = ctx.getMRTmpPath();
      } else {
        // otherwise write to the file system implied by the directory
        // no copy is required. we may want to revisit this policy in future

        try {
          Path qPath = FileUtils.makeQualified(dest_path, conf);
          queryTmpdir = ctx.getTempDirForPath(qPath, true);
        } catch (Exception e) {
          throw new SemanticException("Error creating temporary folder on: "
              + dest_path, e);
        }
      }
      String cols = "";
      String colTypes = "";
      ArrayList colInfos = inputRR.getColumnInfos();

      // CTAS case: the file output format and serde are defined by the create
      // table command rather than taking the default value
      List field_schemas = null;
      CreateTableDesc tblDesc = qb.getTableDesc();
      CreateViewDesc viewDesc = qb.getViewDesc();
      if (tblDesc != null) {
        field_schemas = new ArrayList();
        destTableIsTemporary = tblDesc.isTemporary();
        destTableIsMaterialization = tblDesc.isMaterialization();
      } else if (viewDesc != null) {
        field_schemas = new ArrayList();
        destTableIsTemporary = false;
      }

      boolean first = true;
      for (ColumnInfo colInfo : colInfos) {
        String[] nm = inputRR.reverseLookup(colInfo.getInternalName());

        if (nm[1] != null) { // non-null column alias
          colInfo.setAlias(nm[1]);
        }

        String colName = colInfo.getInternalName();  //default column name
        if (field_schemas != null) {
          FieldSchema col = new FieldSchema();
          if (!("".equals(nm[0])) && nm[1] != null) {
            colName = unescapeIdentifier(colInfo.getAlias()).toLowerCase(); // remove ``
          }
          colName = fixCtasColumnName(colName);
          col.setName(colName);
          String typeName = colInfo.getType().getTypeName();
          // CTAS should NOT create a VOID type
          if (typeName.equals(serdeConstants.VOID_TYPE_NAME)) {
              throw new SemanticException(ErrorMsg.CTAS_CREATES_VOID_TYPE
              .getMsg(colName));
          }
          col.setType(typeName);
          field_schemas.add(col);
        }

        if (!first) {
          cols = cols.concat(",");
          colTypes = colTypes.concat(":");
        }

        first = false;
        cols = cols.concat(colName);

        // Replace VOID type with string when the output is a temp table or
        // local files.
        // A VOID type can be generated under the query:
        //
        // select NULL from tt;
        // or
        // insert overwrite local directory "abc" select NULL from tt;
        //
        // where there is no column type to which the NULL value should be
        // converted.
        //
        String tName = colInfo.getType().getTypeName();
        if (tName.equals(serdeConstants.VOID_TYPE_NAME)) {
          colTypes = colTypes.concat(serdeConstants.STRING_TYPE_NAME);
        } else {
          colTypes = colTypes.concat(tName);
        }
      }

      // update the create table descriptor with the resulting schema.
      if (tblDesc != null) {
        tblDesc.setCols(new ArrayList(field_schemas));
      } else if (viewDesc != null) {
        viewDesc.setSchema(new ArrayList(field_schemas));
      }

      boolean isDestTempFile = true;
      if (!ctx.isMRTmpFileURI(dest_path.toUri().toString())) {
        idToTableNameMap.put(String.valueOf(destTableId), dest_path.toUri().toString());
        currentTableId = destTableId;
        destTableId++;
        isDestTempFile = false;
      }

      boolean isDfsDir = (dest_type.intValue() == QBMetaData.DEST_DFS_FILE);
      loadFileWork.add(new LoadFileDesc(tblDesc, viewDesc, queryTmpdir, dest_path, isDfsDir, cols,
          colTypes));

      if (tblDesc == null) {
        if (viewDesc != null) {
          table_desc = PlanUtils.getTableDesc(viewDesc, cols, colTypes);
        } else if (qb.getIsQuery()) {
          String fileFormat;
          if (SessionState.get().getIsUsingThriftJDBCBinarySerDe()) {
              fileFormat = "SequenceFile";
              HiveConf.setVar(conf, HiveConf.ConfVars.HIVEQUERYRESULTFILEFORMAT, fileFormat);
              table_desc=
                         PlanUtils.getDefaultQueryOutputTableDesc(cols, colTypes, fileFormat,
                           ThriftJDBCBinarySerDe.class);
              // Set the fetch formatter to be a no-op for the ListSinkOperator, since we'll
              // write out formatted thrift objects to SequenceFile
              conf.set(SerDeUtils.LIST_SINK_OUTPUT_FORMATTER, NoOpFetchFormatter.class.getName());
          } else {
              fileFormat = HiveConf.getVar(conf, HiveConf.ConfVars.HIVEQUERYRESULTFILEFORMAT);
              table_desc =
                         PlanUtils.getDefaultQueryOutputTableDesc(cols, colTypes, fileFormat,
                           LazySimpleSerDe.class);
          }
        } else {
          table_desc = PlanUtils.getDefaultTableDesc(qb.getDirectoryDesc(), cols, colTypes);
        }
      } else {
        table_desc = PlanUtils.getTableDesc(tblDesc, cols, colTypes);
      }

      if (!outputs.add(new WriteEntity(dest_path, !isDfsDir, isDestTempFile))) {
        throw new SemanticException(ErrorMsg.OUTPUT_SPECIFIED_MULTIPLE_TIMES
            .getMsg(dest_path.toUri().toString()));
      }
      break;
    }
    default:
      throw new SemanticException("Unknown destination type: " + dest_type);
    }

    if (!(dest_type.intValue() == QBMetaData.DEST_DFS_FILE && qb.getIsQuery())) {
      input = genConversionSelectOperator(dest, qb, input, table_desc, dpCtx);
    }

    inputRR = opParseCtx.get(input).getRowResolver();

    ArrayList vecCol = new ArrayList();

    if (updating(dest) || deleting(dest)) {
      vecCol.add(new ColumnInfo(VirtualColumn.ROWID.getName(), VirtualColumn.ROWID.getTypeInfo(),
          "", true));
    } else {
      try {
        StructObjectInspector rowObjectInspector = (StructObjectInspector) table_desc
            .getDeserializer(conf).getObjectInspector();
        List fields = rowObjectInspector
            .getAllStructFieldRefs();
        for (int i = 0; i < fields.size(); i++) {
          vecCol.add(new ColumnInfo(fields.get(i).getFieldName(), TypeInfoUtils
              .getTypeInfoFromObjectInspector(fields.get(i)
                  .getFieldObjectInspector()), "", false));
        }
      } catch (Exception e) {
        throw new SemanticException(e.getMessage(), e);
      }
    }

    RowSchema fsRS = new RowSchema(vecCol);

    // The output files of a FileSink can be merged if they are either not being written to a table
    // or are being written to a table which is not bucketed
    // and table the table is not sorted
    boolean canBeMerged = (dest_tab == null || !((dest_tab.getNumBuckets() > 0) ||
        (dest_tab.getSortCols() != null && dest_tab.getSortCols().size() > 0)));

    // If this table is working with ACID semantics, turn off merging
    canBeMerged &= !destTableIsAcid;

    // Generate the partition columns from the parent input
    if (dest_type.intValue() == QBMetaData.DEST_TABLE
        || dest_type.intValue() == QBMetaData.DEST_PARTITION) {
      genPartnCols(dest, input, qb, table_desc, dest_tab, rsCtx);
    }

    FileSinkDesc fileSinkDesc = new FileSinkDesc(
      queryTmpdir,
      table_desc,
      conf.getBoolVar(HiveConf.ConfVars.COMPRESSRESULT),
      currentTableId,
      rsCtx.isMultiFileSpray(),
      canBeMerged,
      rsCtx.getNumFiles(),
      rsCtx.getTotalFiles(),
      rsCtx.getPartnCols(),
      dpCtx,
      dest_path);

    boolean isHiveServerQuery = SessionState.get().isHiveServerQuery();
    fileSinkDesc.setHiveServerQuery(isHiveServerQuery);
    // If this is an insert, update, or delete on an ACID table then mark that so the
    // FileSinkOperator knows how to properly write to it.
    if (destTableIsAcid) {
      AcidUtils.Operation wt = updating(dest) ? AcidUtils.Operation.UPDATE :
          (deleting(dest) ? AcidUtils.Operation.DELETE : AcidUtils.Operation.INSERT);
      fileSinkDesc.setWriteType(wt);
      acidFileSinks.add(fileSinkDesc);
    }

    fileSinkDesc.setTemporary(destTableIsTemporary);
    fileSinkDesc.setMaterialization(destTableIsMaterialization);

    /* Set List Bucketing context. */
    if (lbCtx != null) {
      lbCtx.processRowSkewedIndex(fsRS);
      lbCtx.calculateSkewedValueSubDirList();
    }
    fileSinkDesc.setLbCtx(lbCtx);

    // set the stats publishing/aggregating key prefix
    // the same as directory name. The directory name
    // can be changed in the optimizer but the key should not be changed
    // it should be the same as the MoveWork's sourceDir.
    fileSinkDesc.setStatsAggPrefix(fileSinkDesc.getDirName().toString());
    if (!destTableIsMaterialization &&
            HiveConf.getVar(conf, HIVESTATSDBCLASS).equalsIgnoreCase(StatDB.fs.name())) {
      String statsTmpLoc = ctx.getTempDirForPath(dest_path).toString();
      fileSinkDesc.setStatsTmpDir(statsTmpLoc);
      LOG.debug("Set stats collection dir : " + statsTmpLoc);
    }

    if (dest_part != null) {
      try {
        String staticSpec = Warehouse.makePartPath(dest_part.getSpec());
        fileSinkDesc.setStaticSpec(staticSpec);
      } catch (MetaException e) {
        throw new SemanticException(e);
      }
    } else if (dpCtx != null) {
      fileSinkDesc.setStaticSpec(dpCtx.getSPPath());
    }

    if (isHiveServerQuery &&
      null != table_desc &&
      table_desc.getSerdeClassName().equalsIgnoreCase(ThriftJDBCBinarySerDe.class.getName()) &&
      HiveConf.getBoolVar(conf,HiveConf.ConfVars.HIVE_SERVER2_THRIFT_RESULTSET_SERIALIZE_IN_TASKS)) {
        fileSinkDesc.setIsUsingThriftJDBCBinarySerDe(true);
    } else {
        fileSinkDesc.setIsUsingThriftJDBCBinarySerDe(false);
    }

    Operator output = putOpInsertMap(OperatorFactory.getAndMakeChild(
        fileSinkDesc, fsRS, input), inputRR);

    if (ltd != null && SessionState.get() != null) {
      SessionState.get().getLineageState()
          .mapDirToOp(ltd.getSourcePath(), (FileSinkOperator) output);
    } else if ( queryState.getCommandType().equals(HiveOperation.CREATETABLE_AS_SELECT.getOperationName())) {

      Path tlocation = null;
      String tName = Utilities.getDbTableName(tableDesc.getTableName())[1];
      try {
        Warehouse wh = new Warehouse(conf);
        tlocation = wh.getDefaultTablePath(db.getDatabase(tableDesc.getDatabaseName()), tName);
      } catch (MetaException|HiveException e) {
        throw new SemanticException(e);
      }

      SessionState.get().getLineageState()
              .mapDirToOp(tlocation, (FileSinkOperator) output);
    }

    if (LOG.isDebugEnabled()) {
      LOG.debug("Created FileSink Plan for clause: " + dest + "dest_path: "
          + dest_path + " row schema: " + inputRR.toString());
    }

    FileSinkOperator fso = (FileSinkOperator) output;
    fso.getConf().setTable(dest_tab);
    fsopToTable.put(fso, dest_tab);
    // the following code is used to collect column stats when
    // hive.stats.autogather=true
    // and it is an insert overwrite or insert into table
    if (dest_tab != null && conf.getBoolVar(ConfVars.HIVESTATSAUTOGATHER)
        && conf.getBoolVar(ConfVars.HIVESTATSCOLAUTOGATHER)
        && ColumnStatsAutoGatherContext.canRunAutogatherStats(fso)) {
      if (dest_type.intValue() == QBMetaData.DEST_TABLE) {
        genAutoColumnStatsGatheringPipeline(qb, table_desc, partSpec, input, qb.getParseInfo()
            .isInsertIntoTable(dest_tab.getDbName(), dest_tab.getTableName()));
      } else if (dest_type.intValue() == QBMetaData.DEST_PARTITION) {
        genAutoColumnStatsGatheringPipeline(qb, table_desc, dest_part.getSpec(), input, qb
            .getParseInfo().isInsertIntoTable(dest_tab.getDbName(), dest_tab.getTableName()));

      }
    }
    return output;
  }

  private void createInsertDesc(Table table, boolean overwrite) {
    Task[] tasks = new Task[this.rootTasks.size()];
    tasks = this.rootTasks.toArray(tasks);
    PreInsertTableDesc preInsertTableDesc = new PreInsertTableDesc(table, overwrite);
    InsertTableDesc insertTableDesc = new InsertTableDesc(table, overwrite);
    this.rootTasks
            .add(TaskFactory.get(new DDLWork(getInputs(), getOutputs(), preInsertTableDesc), conf));
    TaskFactory
            .getAndMakeChild(new DDLWork(getInputs(), getOutputs(), insertTableDesc), conf, tasks);
  }

  private void genAutoColumnStatsGatheringPipeline(QB qb, TableDesc table_desc,
      Map partSpec, Operator curr, boolean isInsertInto) throws SemanticException {
    String tableName = table_desc.getTableName();
    Table table = null;
    try {
      table = db.getTable(tableName);
    } catch (HiveException e) {
      throw new SemanticException(e.getMessage());
    }
    LOG.info("Generate an operator pipeline to autogather column stats for table " + tableName
        + " in query " + ctx.getCmd());
    ColumnStatsAutoGatherContext columnStatsAutoGatherContext = null;
    columnStatsAutoGatherContext = new ColumnStatsAutoGatherContext(this, conf, curr, table, partSpec, isInsertInto, ctx);
    columnStatsAutoGatherContext.insertAnalyzePipeline();
    columnStatsAutoGatherContexts.add(columnStatsAutoGatherContext);
  }

  String fixCtasColumnName(String colName) {
    return colName;
  }

  // Check constraints on acid tables.  This includes
  // * no insert overwrites
  // * no use of vectorization
  // * turns off reduce deduplication optimization, as that sometimes breaks acid
  // * Check that the table is bucketed
  // * Check that the table is not sorted
  // This method assumes you have already decided that this is an Acid write.  Don't call it if
  // that isn't true.
  private void checkAcidConstraints(QB qb, TableDesc tableDesc,
                                    Table table) throws SemanticException {
    String tableName = tableDesc.getTableName();
    if (!qb.getParseInfo().isInsertIntoTable(tableName)) {
      LOG.debug("Couldn't find table " + tableName + " in insertIntoTable");
      throw new SemanticException(ErrorMsg.NO_INSERT_OVERWRITE_WITH_ACID.getMsg());
    }
    /*
    LOG.info("Modifying config values for ACID write");
    conf.setBoolVar(ConfVars.HIVEOPTREDUCEDEDUPLICATION, true);
    conf.setIntVar(ConfVars.HIVEOPTREDUCEDEDUPLICATIONMINREDUCER, 1);
    These props are now enabled elsewhere (see commit diffs).  It would be better instead to throw
    if they are not set.  For exmaple, if user has set hive.optimize.reducededuplication=false for
    some reason, we'll run a query contrary to what they wanted...  But throwing now would be
    backwards incompatible.
    */
    conf.set(AcidUtils.CONF_ACID_KEY, "true");

    if (table.getNumBuckets() < 1) {
      throw new SemanticException(ErrorMsg.ACID_OP_ON_NONACID_TABLE, table.getTableName());
    }
    if (table.getSortCols() != null && table.getSortCols().size() > 0) {
      throw new SemanticException(ErrorMsg.ACID_NO_SORTED_BUCKETS, table.getTableName());
    }



  }

  /**
   * Generate the conversion SelectOperator that converts the columns into the
   * types that are expected by the table_desc.
   */
  Operator genConversionSelectOperator(String dest, QB qb, Operator input,
      TableDesc table_desc, DynamicPartitionCtx dpCtx) throws SemanticException {
    StructObjectInspector oi = null;
    try {
      Deserializer deserializer = table_desc.getDeserializerClass()
          .newInstance();
      SerDeUtils.initializeSerDe(deserializer, conf, table_desc.getProperties(), null);
      oi = (StructObjectInspector) deserializer.getObjectInspector();
    } catch (Exception e) {
      throw new SemanticException(e);
    }

    // Check column number
    List tableFields = oi.getAllStructFieldRefs();
    boolean dynPart = HiveConf.getBoolVar(conf, HiveConf.ConfVars.DYNAMICPARTITIONING);
    ArrayList rowFields = opParseCtx.get(input).getRowResolver()
        .getColumnInfos();
    int inColumnCnt = rowFields.size();
    int outColumnCnt = tableFields.size();
    if (dynPart && dpCtx != null) {
      outColumnCnt += dpCtx.getNumDPCols();
    }

    // The numbers of input columns and output columns should match for regular query
    if (!updating(dest) && !deleting(dest) && inColumnCnt != outColumnCnt) {
      String reason = "Table " + dest + " has " + outColumnCnt
          + " columns, but query has " + inColumnCnt + " columns.";
      throw new SemanticException(ErrorMsg.TARGET_TABLE_COLUMN_MISMATCH.getMsg(
          qb.getParseInfo().getDestForClause(dest), reason));
    }

    // Check column types
    boolean converted = false;
    int columnNumber = tableFields.size();
    ArrayList expressions = new ArrayList(
        columnNumber);

    // MetadataTypedColumnsetSerDe does not need type conversions because it
    // does the conversion to String by itself.
    boolean isMetaDataSerDe = table_desc.getDeserializerClass().equals(
        MetadataTypedColumnsetSerDe.class);
    boolean isLazySimpleSerDe = table_desc.getDeserializerClass().equals(
        LazySimpleSerDe.class);
    if (!isMetaDataSerDe && !deleting(dest)) {

      // If we're updating, add the ROW__ID expression, then make the following column accesses
      // offset by 1 so that we don't try to convert the ROW__ID
      if (updating(dest)) {
        expressions.add(new ExprNodeColumnDesc(rowFields.get(0).getType(),
            rowFields.get(0).getInternalName(), "", true));
      }

      // here only deals with non-partition columns. We deal with partition columns next
      for (int i = 0; i < columnNumber; i++) {
        int rowFieldsOffset = updating(dest) ? i + 1 : i;
        ObjectInspector tableFieldOI = tableFields.get(i)
            .getFieldObjectInspector();
        TypeInfo tableFieldTypeInfo = TypeInfoUtils
            .getTypeInfoFromObjectInspector(tableFieldOI);
        TypeInfo rowFieldTypeInfo = rowFields.get(rowFieldsOffset).getType();
        ExprNodeDesc column = new ExprNodeColumnDesc(rowFieldTypeInfo,
            rowFields.get(rowFieldsOffset).getInternalName(), "", false,
            rowFields.get(rowFieldsOffset).isSkewedCol());
        // LazySimpleSerDe can convert any types to String type using
        // JSON-format. However, we may add more operators.
        // Thus, we still keep the conversion.
        if (!tableFieldTypeInfo.equals(rowFieldTypeInfo)) {
          // need to do some conversions here
          converted = true;
          if (tableFieldTypeInfo.getCategory() != Category.PRIMITIVE) {
            // cannot convert to complex types
            column = null;
          } else {
            column = ParseUtils.createConversionCast(
                column, (PrimitiveTypeInfo)tableFieldTypeInfo);
          }
          if (column == null) {
            String reason = "Cannot convert column " + i + " from "
                + rowFieldTypeInfo + " to " + tableFieldTypeInfo + ".";
            throw new SemanticException(ErrorMsg.TARGET_TABLE_COLUMN_MISMATCH
                .getMsg(qb.getParseInfo().getDestForClause(dest), reason));
          }
        }
        expressions.add(column);
      }
    }

    // deal with dynamic partition columns: convert ExprNodeDesc type to String??
    if (dynPart && dpCtx != null && dpCtx.getNumDPCols() > 0) {
      // DP columns starts with tableFields.size()
      for (int i = tableFields.size() + (updating(dest) ? 1 : 0); i < rowFields.size(); ++i) {
        TypeInfo rowFieldTypeInfo = rowFields.get(i).getType();
        ExprNodeDesc column = new ExprNodeColumnDesc(
            rowFieldTypeInfo, rowFields.get(i).getInternalName(), "", true);
        expressions.add(column);
      }
      // converted = true; // [TODO]: should we check & convert type to String and set it to true?
    }

    if (converted) {
      // add the select operator
      RowResolver rowResolver = new RowResolver();
      ArrayList colNames = new ArrayList();
      Map colExprMap = new HashMap();
      for (int i = 0; i < expressions.size(); i++) {
        String name = getColumnInternalName(i);
        rowResolver.put("", name, new ColumnInfo(name, expressions.get(i)
            .getTypeInfo(), "", false));
        colNames.add(name);
        colExprMap.put(name, expressions.get(i));
      }
      input = putOpInsertMap(OperatorFactory.getAndMakeChild(
          new SelectDesc(expressions, colNames), new RowSchema(rowResolver
              .getColumnInfos()), input), rowResolver);
      input.setColumnExprMap(colExprMap);
    }
    return input;
  }

  @SuppressWarnings("nls")
  private Operator genLimitPlan(String dest, QB qb, Operator input, int offset, int limit)
      throws SemanticException {
    // A map-only job can be optimized - instead of converting it to a
    // map-reduce job, we can have another map
    // job to do the same to avoid the cost of sorting in the map-reduce phase.
    // A better approach would be to
    // write into a local file and then have a map-only job.
    // Add the limit operator to get the value fields

    RowResolver inputRR = opParseCtx.get(input).getRowResolver();

    LimitDesc limitDesc = new LimitDesc(offset, limit);
    globalLimitCtx.setLastReduceLimitDesc(limitDesc);

    Operator limitMap = putOpInsertMap(OperatorFactory.getAndMakeChild(
        limitDesc, new RowSchema(inputRR.getColumnInfos()), input),
        inputRR);

    if (LOG.isDebugEnabled()) {
      LOG.debug("Created LimitOperator Plan for clause: " + dest
          + " row schema: " + inputRR.toString());
    }

    return limitMap;
  }

  private Operator genUDTFPlan(GenericUDTF genericUDTF,
      String outputTableAlias, ArrayList colAliases, QB qb,
      Operator input, boolean outerLV) throws SemanticException {

    // No GROUP BY / DISTRIBUTE BY / SORT BY / CLUSTER BY
    QBParseInfo qbp = qb.getParseInfo();
    if (!qbp.getDestToGroupBy().isEmpty()) {
      throw new SemanticException(ErrorMsg.UDTF_NO_GROUP_BY.getMsg());
    }
    if (!qbp.getDestToDistributeBy().isEmpty()) {
      throw new SemanticException(ErrorMsg.UDTF_NO_DISTRIBUTE_BY.getMsg());
    }
    if (!qbp.getDestToSortBy().isEmpty()) {
      throw new SemanticException(ErrorMsg.UDTF_NO_SORT_BY.getMsg());
    }
    if (!qbp.getDestToClusterBy().isEmpty()) {
      throw new SemanticException(ErrorMsg.UDTF_NO_CLUSTER_BY.getMsg());
    }
    if (!qbp.getAliasToLateralViews().isEmpty()) {
      throw new SemanticException(ErrorMsg.UDTF_LATERAL_VIEW.getMsg());
    }

    if (LOG.isDebugEnabled()) {
      LOG.debug("Table alias: " + outputTableAlias + " Col aliases: "
          + colAliases);
    }

    // Use the RowResolver from the input operator to generate a input
    // ObjectInspector that can be used to initialize the UDTF. Then, the

    // resulting output object inspector can be used to make the RowResolver
    // for the UDTF operator
    RowResolver selectRR = opParseCtx.get(input).getRowResolver();
    ArrayList inputCols = selectRR.getColumnInfos();

    // Create the object inspector for the input columns and initialize the UDTF
    ArrayList colNames = new ArrayList();
    ObjectInspector[] colOIs = new ObjectInspector[inputCols.size()];
    for (int i = 0; i < inputCols.size(); i++) {
      colNames.add(inputCols.get(i).getInternalName());
      colOIs[i] = inputCols.get(i).getObjectInspector();
    }
    StandardStructObjectInspector rowOI =
        ObjectInspectorFactory.getStandardStructObjectInspector(colNames, Arrays.asList(colOIs));
    StructObjectInspector outputOI = genericUDTF.initialize(rowOI);

    int numUdtfCols = outputOI.getAllStructFieldRefs().size();
    if (colAliases.isEmpty()) {
      // user did not specfied alias names, infer names from outputOI
      for (StructField field : outputOI.getAllStructFieldRefs()) {
        colAliases.add(field.getFieldName());
      }
    }
    // Make sure that the number of column aliases in the AS clause matches
    // the number of columns output by the UDTF
    int numSuppliedAliases = colAliases.size();
    if (numUdtfCols != numSuppliedAliases) {
      throw new SemanticException(ErrorMsg.UDTF_ALIAS_MISMATCH
          .getMsg("expected " + numUdtfCols + " aliases " + "but got "
              + numSuppliedAliases));
    }

    // Generate the output column info's / row resolver using internal names.
    ArrayList udtfCols = new ArrayList();

    Iterator colAliasesIter = colAliases.iterator();
    for (StructField sf : outputOI.getAllStructFieldRefs()) {

      String colAlias = colAliasesIter.next();
      assert (colAlias != null);

      // Since the UDTF operator feeds into a LVJ operator that will rename
      // all the internal names, we can just use field name from the UDTF's OI
      // as the internal name
      ColumnInfo col = new ColumnInfo(sf.getFieldName(), TypeInfoUtils
          .getTypeInfoFromObjectInspector(sf.getFieldObjectInspector()),
          outputTableAlias, false);
      udtfCols.add(col);
    }

    // Create the row resolver for this operator from the output columns
    RowResolver out_rwsch = new RowResolver();
    for (int i = 0; i < udtfCols.size(); i++) {
      out_rwsch.put(outputTableAlias, colAliases.get(i), udtfCols.get(i));
    }

    // Add the UDTFOperator to the operator DAG
    Operator udtf = putOpInsertMap(OperatorFactory.getAndMakeChild(
        new UDTFDesc(genericUDTF, outerLV), new RowSchema(out_rwsch.getColumnInfos()),
        input), out_rwsch);
    return udtf;
  }

  @SuppressWarnings("nls")
  private Operator genLimitMapRedPlan(String dest, QB qb, Operator input,
      int offset, int limit, boolean extraMRStep) throws SemanticException {
    // A map-only job can be optimized - instead of converting it to a
    // map-reduce job, we can have another map
    // job to do the same to avoid the cost of sorting in the map-reduce phase.
    // A better approach would be to
    // write into a local file and then have a map-only job.
    // Add the limit operator to get the value fields
    Operator curr = genLimitPlan(dest, qb, input, offset, limit);

    // the client requested that an extra map-reduce step be performed
    if (!extraMRStep  || !HiveConf.getBoolVar(conf, HiveConf.ConfVars.HIVE_GROUPBY_LIMIT_EXTRASTEP)){
      return curr;
    }

    // Create a reduceSink operator followed by another limit
    curr = genReduceSinkPlan(dest, qb, curr, 1, false);
    return genLimitPlan(dest, qb, curr, offset, limit);
  }

  private ArrayList getPartitionColsFromBucketCols(String dest, QB qb, Table tab,
      TableDesc table_desc, Operator input, boolean convert)
      throws SemanticException {
    List tabBucketCols = tab.getBucketCols();
    List tabCols = tab.getCols();

    // Partition by the bucketing column
    List posns = new ArrayList();

    for (String bucketCol : tabBucketCols) {
      int pos = 0;
      for (FieldSchema tabCol : tabCols) {
        if (bucketCol.equals(tabCol.getName())) {
          posns.add(pos);
          break;
        }
        pos++;
      }
    }

    return genConvertCol(dest, qb, tab, table_desc, input, posns, convert);
  }

  // We have to set up the bucketing columns differently for update and deletes,
  // as it is always using the ROW__ID column.
  private ArrayList getPartitionColsFromBucketColsForUpdateDelete(
      Operator input, boolean convert) throws SemanticException {
    //return genConvertCol(dest, qb, tab, table_desc, input, Arrays.asList(0), convert);
    // In the case of update and delete the bucketing column is always the first column,
    // and it isn't in the table info.  So rather than asking the table for it,
    // we'll construct it ourself and send it back.  This is based on the work done in
    // genConvertCol below.
    ColumnInfo rowField = opParseCtx.get(input).getRowResolver().getColumnInfos().get(0);
    TypeInfo rowFieldTypeInfo = rowField.getType();
    ExprNodeDesc column = new ExprNodeColumnDesc(rowFieldTypeInfo, rowField.getInternalName(),
        rowField.getTabAlias(), true);
    if (convert) {
      column = ParseUtils.createConversionCast(column, TypeInfoFactory.intTypeInfo);
    }
    ArrayList rlist = new ArrayList(1);
    rlist.add(column);
    return rlist;
  }

  private ArrayList genConvertCol(String dest, QB qb, Table tab,
      TableDesc table_desc, Operator input, List posns, boolean convert)
      throws SemanticException {
    StructObjectInspector oi = null;
    try {
      Deserializer deserializer = table_desc.getDeserializerClass()
          .newInstance();
      SerDeUtils.initializeSerDe(deserializer, conf, table_desc.getProperties(), null);
      oi = (StructObjectInspector) deserializer.getObjectInspector();
    } catch (Exception e) {
      throw new SemanticException(e);
    }

    List tableFields = oi.getAllStructFieldRefs();
    ArrayList rowFields = opParseCtx.get(input).getRowResolver()
        .getColumnInfos();

    // Check column type
    int columnNumber = posns.size();
    ArrayList expressions = new ArrayList(columnNumber);
    for (Integer posn : posns) {
      ObjectInspector tableFieldOI = tableFields.get(posn).getFieldObjectInspector();
      TypeInfo tableFieldTypeInfo = TypeInfoUtils.getTypeInfoFromObjectInspector(tableFieldOI);
      TypeInfo rowFieldTypeInfo = rowFields.get(posn).getType();
      ExprNodeDesc column = new ExprNodeColumnDesc(rowFieldTypeInfo,
          rowFields.get(posn).getInternalName(), rowFields.get(posn).getTabAlias(),
          rowFields.get(posn).getIsVirtualCol());

      if (convert && !tableFieldTypeInfo.equals(rowFieldTypeInfo)) {
        // need to do some conversions here
        if (tableFieldTypeInfo.getCategory() != Category.PRIMITIVE) {
          // cannot convert to complex types
          column = null;
        } else {
          column = ParseUtils.createConversionCast(
              column, (PrimitiveTypeInfo)tableFieldTypeInfo);
        }
        if (column == null) {
          String reason = "Cannot convert column " + posn + " from "
              + rowFieldTypeInfo + " to " + tableFieldTypeInfo + ".";
          throw new SemanticException(ErrorMsg.TARGET_TABLE_COLUMN_MISMATCH
              .getMsg(qb.getParseInfo().getDestForClause(dest), reason));
        }
      }
      expressions.add(column);
    }

    return expressions;
  }

  private ArrayList getSortCols(String dest, QB qb, Table tab, TableDesc table_desc,
      Operator input, boolean convert)
      throws SemanticException {
    List tabSortCols = tab.getSortCols();
    List tabCols = tab.getCols();

    // Partition by the bucketing column
    List posns = new ArrayList();
    for (Order sortCol : tabSortCols) {
      int pos = 0;
      for (FieldSchema tabCol : tabCols) {
        if (sortCol.getCol().equals(tabCol.getName())) {
          posns.add(pos);
          break;
        }
        pos++;
      }
    }

    return genConvertCol(dest, qb, tab, table_desc, input, posns, convert);
  }

  private ArrayList getSortOrders(String dest, QB qb, Table tab, Operator input)
      throws SemanticException {
    List tabSortCols = tab.getSortCols();
    List tabCols = tab.getCols();

    ArrayList orders = new ArrayList();
    for (Order sortCol : tabSortCols) {
      for (FieldSchema tabCol : tabCols) {
        if (sortCol.getCol().equals(tabCol.getName())) {
          orders.add(sortCol.getOrder());
          break;
        }
      }
    }
    return orders;
  }

  private Operator genReduceSinkPlan(String dest, QB qb, Operator input,
      int numReducers, boolean hasOrderBy) throws SemanticException {

    RowResolver inputRR = opParseCtx.get(input).getRowResolver();

    // First generate the expression for the partition and sort keys
    // The cluster by clause / distribute by clause has the aliases for
    // partition function
    ASTNode partitionExprs = qb.getParseInfo().getClusterByForClause(dest);
    if (partitionExprs == null) {
      partitionExprs = qb.getParseInfo().getDistributeByForClause(dest);
    }
    ArrayList partCols = new ArrayList();
    if (partitionExprs != null) {
      int ccount = partitionExprs.getChildCount();
      for (int i = 0; i < ccount; ++i) {
        ASTNode cl = (ASTNode) partitionExprs.getChild(i);
        partCols.add(genExprNodeDesc(cl, inputRR));
      }
    }
    ASTNode sortExprs = qb.getParseInfo().getClusterByForClause(dest);
    if (sortExprs == null) {
      sortExprs = qb.getParseInfo().getSortByForClause(dest);
    }

    if (sortExprs == null) {
      sortExprs = qb.getParseInfo().getOrderByForClause(dest);
      if (sortExprs != null) {
        assert numReducers == 1;
        // in strict mode, in the presence of order by, limit must be specified
        if (qb.getParseInfo().getDestLimit(dest) == null) {
          String error = StrictChecks.checkNoLimit(conf);
          if (error != null) {
            throw new SemanticException(generateErrorMessage(sortExprs, error));
          }
        }
      }
    }
    ArrayList sortCols = new ArrayList();
    StringBuilder order = new StringBuilder();
    StringBuilder nullOrder = new StringBuilder();
    if (sortExprs != null) {
      int ccount = sortExprs.getChildCount();
      for (int i = 0; i < ccount; ++i) {
        ASTNode cl = (ASTNode) sortExprs.getChild(i);

        if (cl.getType() == HiveParser.TOK_TABSORTCOLNAMEASC) {
          // SortBy ASC
          order.append("+");
          cl = (ASTNode) cl.getChild(0);
          if (cl.getType() == HiveParser.TOK_NULLS_FIRST) {
            nullOrder.append("a");
          } else if (cl.getType() == HiveParser.TOK_NULLS_LAST) {
            nullOrder.append("z");
          } else {
            throw new SemanticException(
                    "Unexpected null ordering option: " + cl.getType());
          }
          cl = (ASTNode) cl.getChild(0);
        } else if (cl.getType() == HiveParser.TOK_TABSORTCOLNAMEDESC) {
          // SortBy DESC
          order.append("-");
          cl = (ASTNode) cl.getChild(0);
          if (cl.getType() == HiveParser.TOK_NULLS_FIRST) {
            nullOrder.append("a");
          } else if (cl.getType() == HiveParser.TOK_NULLS_LAST) {
            nullOrder.append("z");
          } else {
            throw new SemanticException(
                    "Unexpected null ordering option: " + cl.getType());
          }
          cl = (ASTNode) cl.getChild(0);
        } else {
          // ClusterBy
          order.append("+");
          nullOrder.append("a");
        }
        ExprNodeDesc exprNode = genExprNodeDesc(cl, inputRR);
        sortCols.add(exprNode);
      }
    }
    Operator result = genReduceSinkPlan(
        input, partCols, sortCols, order.toString(), nullOrder.toString(),
        numReducers, Operation.NOT_ACID, true);
    if (result.getParentOperators().size() == 1 &&
        result.getParentOperators().get(0) instanceof ReduceSinkOperator) {
      ((ReduceSinkOperator) result.getParentOperators().get(0))
          .getConf().setHasOrderBy(hasOrderBy);
    }
    return result;
  }

  private Operator genReduceSinkPlan(Operator input,
          ArrayList partitionCols, ArrayList sortCols,
          String sortOrder, String nullOrder, int numReducers, AcidUtils.Operation acidOp)
                  throws SemanticException {
    return genReduceSinkPlan(input, partitionCols, sortCols, sortOrder, nullOrder, numReducers,
            acidOp, false);
  }

  @SuppressWarnings("nls")
  private Operator genReduceSinkPlan(Operator input,
      ArrayList partitionCols, ArrayList sortCols,
      String sortOrder, String nullOrder, int numReducers, AcidUtils.Operation acidOp,
      boolean pullConstants) throws SemanticException {

    RowResolver inputRR = opParseCtx.get(input).getRowResolver();

    Operator dummy = Operator.createDummy();
    dummy.setParentOperators(Arrays.asList(input));

    ArrayList newSortCols = new ArrayList();
    StringBuilder newSortOrder = new StringBuilder();
    StringBuilder newNullOrder = new StringBuilder();
    ArrayList sortColsBack = new ArrayList();
    for (int i = 0; i < sortCols.size(); i++) {
      ExprNodeDesc sortCol = sortCols.get(i);
      // If we are not pulling constants, OR
      // we are pulling constants but this is not a constant
      if (!pullConstants || !(sortCol instanceof ExprNodeConstantDesc)) {
        newSortCols.add(sortCol);
        newSortOrder.append(sortOrder.charAt(i));
        newNullOrder.append(nullOrder.charAt(i));
        sortColsBack.add(ExprNodeDescUtils.backtrack(sortCol, dummy, input));
      }
    }

    // For the generation of the values expression just get the inputs
    // signature and generate field expressions for those
    RowResolver rsRR = new RowResolver();
    ArrayList outputColumns = new ArrayList();
    ArrayList valueCols = new ArrayList();
    ArrayList valueColsBack = new ArrayList();
    Map colExprMap = new HashMap();
    ArrayList constantCols = new ArrayList();

    ArrayList columnInfos = inputRR.getColumnInfos();

    int[] index = new int[columnInfos.size()];
    for (int i = 0; i < index.length; i++) {
      ColumnInfo colInfo = columnInfos.get(i);
      String[] nm = inputRR.reverseLookup(colInfo.getInternalName());
      String[] nm2 = inputRR.getAlternateMappings(colInfo.getInternalName());
      ExprNodeColumnDesc value = new ExprNodeColumnDesc(colInfo);

      // backtrack can be null when input is script operator
      ExprNodeDesc valueBack = ExprNodeDescUtils.backtrack(value, dummy, input);
      if (pullConstants && valueBack instanceof ExprNodeConstantDesc) {
        // ignore, it will be generated by SEL op
        index[i] = Integer.MAX_VALUE;
        constantCols.add(valueBack);
        continue;
      }
      int kindex = valueBack == null ? -1 : ExprNodeDescUtils.indexOf(valueBack, sortColsBack);
      if (kindex >= 0) {
        index[i] = kindex;
        ColumnInfo newColInfo = new ColumnInfo(colInfo);
        newColInfo.setInternalName(Utilities.ReduceField.KEY + ".reducesinkkey" + kindex);
        newColInfo.setTabAlias(nm[0]);
        rsRR.put(nm[0], nm[1], newColInfo);
        if (nm2 != null) {
          rsRR.addMappingOnly(nm2[0], nm2[1], newColInfo);
        }
        continue;
      }
      int vindex = valueBack == null ? -1 : ExprNodeDescUtils.indexOf(valueBack, valueColsBack);
      if (vindex >= 0) {
        index[i] = -vindex - 1;
        continue;
      }
      index[i] = -valueCols.size() - 1;
      String outputColName = getColumnInternalName(valueCols.size());

      valueCols.add(value);
      valueColsBack.add(valueBack);

      ColumnInfo newColInfo = new ColumnInfo(colInfo);
      newColInfo.setInternalName(Utilities.ReduceField.VALUE + "." + outputColName);
      newColInfo.setTabAlias(nm[0]);

      rsRR.put(nm[0], nm[1], newColInfo);
      if (nm2 != null) {
        rsRR.addMappingOnly(nm2[0], nm2[1], newColInfo);
      }
      outputColumns.add(outputColName);
    }

    dummy.setParentOperators(null);

    ReduceSinkDesc rsdesc = PlanUtils.getReduceSinkDesc(newSortCols, valueCols, outputColumns,
        false, -1, partitionCols, newSortOrder.toString(), newNullOrder.toString(),
        numReducers, acidOp);
    Operator interim = putOpInsertMap(OperatorFactory.getAndMakeChild(rsdesc,
        new RowSchema(rsRR.getColumnInfos()), input), rsRR);

    List keyColNames = rsdesc.getOutputKeyColumnNames();
    for (int i = 0 ; i < keyColNames.size(); i++) {
      colExprMap.put(Utilities.ReduceField.KEY + "." + keyColNames.get(i), sortCols.get(i));
    }
    List valueColNames = rsdesc.getOutputValueColumnNames();
    for (int i = 0 ; i < valueColNames.size(); i++) {
      colExprMap.put(Utilities.ReduceField.VALUE + "." + valueColNames.get(i), valueCols.get(i));
    }
    interim.setColumnExprMap(colExprMap);

    RowResolver selectRR = new RowResolver();
    ArrayList selCols = new ArrayList();
    ArrayList selOutputCols = new ArrayList();
    Map selColExprMap = new HashMap();

    Iterator constants = constantCols.iterator();
    for (int i = 0; i < index.length; i++) {
      ColumnInfo prev = columnInfos.get(i);
      String[] nm = inputRR.reverseLookup(prev.getInternalName());
      String[] nm2 = inputRR.getAlternateMappings(prev.getInternalName());
      ColumnInfo info = new ColumnInfo(prev);

      ExprNodeDesc desc;
      if (index[i] == Integer.MAX_VALUE) {
        desc = constants.next();
      } else {
        String field;
        if (index[i] >= 0) {
          field = Utilities.ReduceField.KEY + "." + keyColNames.get(index[i]);
        } else {
          field = Utilities.ReduceField.VALUE + "." + valueColNames.get(-index[i] - 1);
        }
        desc = new ExprNodeColumnDesc(info.getType(),
                field, info.getTabAlias(), info.getIsVirtualCol());
      }
      selCols.add(desc);

      String internalName = getColumnInternalName(i);
      info.setInternalName(internalName);
      selectRR.put(nm[0], nm[1], info);
      if (nm2 != null) {
        selectRR.addMappingOnly(nm2[0], nm2[1], info);
      }
      selOutputCols.add(internalName);
      selColExprMap.put(internalName, desc);
    }
    SelectDesc select = new SelectDesc(selCols, selOutputCols);
    Operator output = putOpInsertMap(OperatorFactory.getAndMakeChild(select,
        new RowSchema(selectRR.getColumnInfos()), interim), selectRR);
    output.setColumnExprMap(selColExprMap);
    return output;
  }

  private Operator genJoinOperatorChildren(QBJoinTree join, Operator left,
      Operator[] right, HashSet omitOpts, ExprNodeDesc[][] joinKeys) throws SemanticException {

    RowResolver outputRR = new RowResolver();
    ArrayList outputColumnNames = new ArrayList();
    // all children are base classes
    Operator[] rightOps = new Operator[right.length];
    int outputPos = 0;

    Map reversedExprs = new HashMap();
    HashMap> exprMap = new HashMap>();
    Map colExprMap = new HashMap();
    HashMap> posToAliasMap = new HashMap>();
    HashMap> filterMap =
        new HashMap>();

    for (int pos = 0; pos < right.length; ++pos) {
      Operator input = right[pos] == null ? left : right[pos];
      if (input == null) {
        input = left;
      }
      ReduceSinkOperator rs = (ReduceSinkOperator) input;
      if (rs.getNumParent() != 1) {
        throw new SemanticException("RS should have single parent");
      }
      Operator parent = rs.getParentOperators().get(0);
      ReduceSinkDesc rsDesc = (ReduceSinkDesc) (input.getConf());

      int[] index = rs.getValueIndex();

      ArrayList valueDesc = new ArrayList();
      ArrayList filterDesc = new ArrayList();
      Byte tag = (byte) rsDesc.getTag();

      // check whether this input operator produces output
      if (omitOpts != null && omitOpts.contains(pos)) {
        exprMap.put(tag, valueDesc);
        filterMap.put(tag, filterDesc);
        rightOps[pos] = input;
        continue;
      }

      List keyColNames = rsDesc.getOutputKeyColumnNames();
      List valColNames = rsDesc.getOutputValueColumnNames();

      // prepare output descriptors for the input opt
      RowResolver inputRR = opParseCtx.get(input).getRowResolver();
      RowResolver parentRR = opParseCtx.get(parent).getRowResolver();
      posToAliasMap.put(pos, new HashSet(inputRR.getTableNames()));

      List columns = parentRR.getColumnInfos();
      for (int i = 0; i < index.length; i++) {
        ColumnInfo prev = columns.get(i);
        String[] nm = parentRR.reverseLookup(prev.getInternalName());
        String[] nm2 = parentRR.getAlternateMappings(prev.getInternalName());
        if (outputRR.get(nm[0], nm[1]) != null) {
          continue;
        }
        ColumnInfo info = new ColumnInfo(prev);
        String field;
        if (index[i] >= 0) {
          field = Utilities.ReduceField.KEY + "." + keyColNames.get(index[i]);
        } else {
          field = Utilities.ReduceField.VALUE + "." + valColNames.get(-index[i] - 1);
        }
        String internalName = getColumnInternalName(outputColumnNames.size());
        ExprNodeColumnDesc desc = new ExprNodeColumnDesc(info.getType(),
            field, info.getTabAlias(), info.getIsVirtualCol());

        info.setInternalName(internalName);
        colExprMap.put(internalName, desc);
        outputRR.put(nm[0], nm[1], info);
        if (nm2 != null) {
          outputRR.addMappingOnly(nm2[0], nm2[1], info);
        }

        valueDesc.add(desc);
        outputColumnNames.add(internalName);
        reversedExprs.put(internalName, tag);
      }
      for (ASTNode cond : join.getFilters().get(tag)) {
        filterDesc.add(genExprNodeDesc(cond, inputRR));
      }
      exprMap.put(tag, valueDesc);
      filterMap.put(tag, filterDesc);
      rightOps[pos] = input;
    }

    JoinCondDesc[] joinCondns = new JoinCondDesc[join.getJoinCond().length];
    for (int i = 0; i < join.getJoinCond().length; i++) {
      JoinCond condn = join.getJoinCond()[i];
      joinCondns[i] = new JoinCondDesc(condn);
    }

    JoinDesc desc = new JoinDesc(exprMap, outputColumnNames,
        join.getNoOuterJoin(), joinCondns, filterMap, joinKeys);
    desc.setReversedExprs(reversedExprs);
    desc.setFilterMap(join.getFilterMap());
    // For outer joins, add filters that apply to more than one input
    if (!join.getNoOuterJoin() && join.getPostJoinFilters().size() != 0) {
      List residualFilterExprs = new ArrayList();
      for (ASTNode cond : join.getPostJoinFilters()) {
        residualFilterExprs.add(genExprNodeDesc(cond, outputRR));
      }
      desc.setResidualFilterExprs(residualFilterExprs);
      // Clean post-conditions
      join.getPostJoinFilters().clear();
    }

    JoinOperator joinOp = (JoinOperator) OperatorFactory.getAndMakeChild(getOpContext(), desc,
        new RowSchema(outputRR.getColumnInfos()), rightOps);
    joinOp.setColumnExprMap(colExprMap);
    joinOp.setPosToAliasMap(posToAliasMap);

    if (join.getNullSafes() != null) {
      boolean[] nullsafes = new boolean[join.getNullSafes().size()];
      for (int i = 0; i < nullsafes.length; i++) {
        nullsafes[i] = join.getNullSafes().get(i);
      }
      desc.setNullSafes(nullsafes);
    }
    return putOpInsertMap(joinOp, outputRR);
  }

  private ExprNodeDesc[][] genJoinKeys(QBJoinTree joinTree, Operator[] inputs)
      throws SemanticException {
    ExprNodeDesc[][] joinKeys = new ExprNodeDesc[inputs.length][];
    for (int i = 0; i < inputs.length; i++) {
      RowResolver inputRR = opParseCtx.get(inputs[i]).getRowResolver();
      List expressions = joinTree.getExpressions().get(i);
      joinKeys[i] = new ExprNodeDesc[expressions.size()];
      for (int j = 0; j < joinKeys[i].length; j++) {
        joinKeys[i][j] = genExprNodeDesc(expressions.get(j), inputRR, true, isCBOExecuted());
      }
    }
    // Type checking and implicit type conversion for join keys
    return genJoinOperatorTypeCheck(joinKeys);
  }

  @SuppressWarnings("nls")
  private Operator genJoinReduceSinkChild(QB qb, ExprNodeDesc[] joinKeys,
      Operator child, String[] srcs, int tag) throws SemanticException {

    Operator dummy = Operator.createDummy();  // dummy for backtracking
    dummy.setParentOperators(Arrays.asList(child));

    RowResolver inputRR = opParseCtx.get(child).getRowResolver();
    RowResolver outputRR = new RowResolver();
    ArrayList outputColumns = new ArrayList();
    ArrayList reduceKeys = new ArrayList();
    ArrayList reduceKeysBack = new ArrayList();

    // Compute join keys and store in reduceKeys
    for (ExprNodeDesc joinKey : joinKeys) {
      reduceKeys.add(joinKey);
      reduceKeysBack.add(ExprNodeDescUtils.backtrack(joinKey, dummy, child));
    }

    // Walk over the input row resolver and copy in the output
    ArrayList reduceValues = new ArrayList();
    ArrayList reduceValuesBack = new ArrayList();
    Map colExprMap = new HashMap();

    List columns = inputRR.getColumnInfos();
    int[] index = new int[columns.size()];
    for (int i = 0; i < columns.size(); i++) {
      ColumnInfo colInfo = columns.get(i);
      String[] nm = inputRR.reverseLookup(colInfo.getInternalName());
      String[] nm2 = inputRR.getAlternateMappings(colInfo.getInternalName());
      ExprNodeDesc expr = new ExprNodeColumnDesc(colInfo);

      // backtrack can be null when input is script operator
      ExprNodeDesc exprBack = ExprNodeDescUtils.backtrack(expr, dummy, child);
      int kindex;
      if (exprBack == null) {
        kindex = -1;
      } else if (ExprNodeDescUtils.isConstant(exprBack)) {
        kindex = reduceKeysBack.indexOf(exprBack);
      } else {
        kindex = ExprNodeDescUtils.indexOf(exprBack, reduceKeysBack);
      }
      if (kindex >= 0) {
        ColumnInfo newColInfo = new ColumnInfo(colInfo);
        newColInfo.setInternalName(Utilities.ReduceField.KEY + ".reducesinkkey" + kindex);
        newColInfo.setTabAlias(nm[0]);
        outputRR.put(nm[0], nm[1], newColInfo);
        if (nm2 != null) {
          outputRR.addMappingOnly(nm2[0], nm2[1], newColInfo);
        }
        index[i] = kindex;
        continue;
      }
      index[i] = -reduceValues.size() - 1;
      String outputColName = getColumnInternalName(reduceValues.size());

      reduceValues.add(expr);
      reduceValuesBack.add(exprBack);

      ColumnInfo newColInfo = new ColumnInfo(colInfo);
      newColInfo.setInternalName(Utilities.ReduceField.VALUE + "." + outputColName);
      newColInfo.setTabAlias(nm[0]);

      outputRR.put(nm[0], nm[1], newColInfo);
      if (nm2 != null) {
        outputRR.addMappingOnly(nm2[0], nm2[1], newColInfo);
      }
      outputColumns.add(outputColName);
    }
    dummy.setParentOperators(null);

    int numReds = -1;

    // Use only 1 reducer in case of cartesian product
    if (reduceKeys.size() == 0) {
      numReds = 1;
      String error = StrictChecks.checkCartesian(conf);
      if (error != null) throw new SemanticException(error);
    }

    ReduceSinkDesc rsDesc = PlanUtils.getReduceSinkDesc(reduceKeys,
        reduceValues, outputColumns, false, tag,
        reduceKeys.size(), numReds, AcidUtils.Operation.NOT_ACID);

    ReduceSinkOperator rsOp = (ReduceSinkOperator) putOpInsertMap(
        OperatorFactory.getAndMakeChild(rsDesc, new RowSchema(outputRR.getColumnInfos()),
            child), outputRR);
    List keyColNames = rsDesc.getOutputKeyColumnNames();
    for (int i = 0 ; i < keyColNames.size(); i++) {
      colExprMap.put(Utilities.ReduceField.KEY + "." + keyColNames.get(i), reduceKeys.get(i));
    }
    List valColNames = rsDesc.getOutputValueColumnNames();
    for (int i = 0 ; i < valColNames.size(); i++) {
      colExprMap.put(Utilities.ReduceField.VALUE + "." + valColNames.get(i), reduceValues.get(i));
    }

    rsOp.setValueIndex(index);
    rsOp.setColumnExprMap(colExprMap);
    rsOp.setInputAliases(srcs);
    return rsOp;
  }

  private Operator genJoinOperator(QB qb, QBJoinTree joinTree,
      Map map,
      Operator joiningOp) throws SemanticException {
    QBJoinTree leftChild = joinTree.getJoinSrc();
    Operator joinSrcOp = joiningOp instanceof JoinOperator ? joiningOp : null;

    if (joinSrcOp == null && leftChild != null) {
      joinSrcOp = genJoinOperator(qb, leftChild, map, null);
    }

    if ( joinSrcOp != null ) {
      ArrayList filter = joinTree.getFiltersForPushing().get(0);
      for (ASTNode cond : filter) {
        joinSrcOp = genFilterPlan(qb, cond, joinSrcOp, false);
      }
    }

    String[] baseSrc = joinTree.getBaseSrc();
    Operator[] srcOps = new Operator[baseSrc.length];

    HashSet omitOpts = null; // set of input to the join that should be
    // omitted by the output
    int pos = 0;
    for (String src : baseSrc) {
      if (src != null) {
        Operator srcOp = map.get(src.toLowerCase());

        // for left-semi join, generate an additional selection & group-by
        // operator before ReduceSink
        ArrayList fields = joinTree.getRHSSemijoinColumns(src);
        if (fields != null) {
          // the RHS table columns should be not be output from the join
          if (omitOpts == null) {
            omitOpts = new HashSet();
          }
          omitOpts.add(pos);

          // generate a selection operator for group-by keys only
          srcOp = insertSelectForSemijoin(fields, srcOp);

          // generate a groupby operator (HASH mode) for a map-side partial
          // aggregation for semijoin
          srcOps[pos++] = genMapGroupByForSemijoin(qb, fields, srcOp,
              GroupByDesc.Mode.HASH);
        } else {
          srcOps[pos++] = srcOp;
        }
      } else {
        assert pos == 0;
        srcOps[pos++] = joinSrcOp;
      }
    }

    ExprNodeDesc[][] joinKeys = genJoinKeys(joinTree, srcOps);

    for (int i = 0; i < srcOps.length; i++) {
      // generate a ReduceSink operator for the join
      String[] srcs = baseSrc[i] != null ? new String[] {baseSrc[i]} : joinTree.getLeftAliases();
      if (!isCBOExecuted()) {
        srcOps[i] = genNotNullFilterForJoinSourcePlan(qb, srcOps[i], joinTree, joinKeys[i]);
      }
      srcOps[i] = genJoinReduceSinkChild(qb, joinKeys[i], srcOps[i], srcs, joinTree.getNextTag());
    }

    JoinOperator joinOp = (JoinOperator) genJoinOperatorChildren(joinTree,
      joinSrcOp, srcOps, omitOpts, joinKeys);
    joinOp.getConf().setQBJoinTreeProps(joinTree);
    joinContext.put(joinOp, joinTree);

    if (joinTree.getPostJoinFilters().size() != 0) {
      // Safety check for postconditions
      assert joinTree.getNoOuterJoin();
      Operator op = joinOp;
      for(ASTNode condn : joinTree.getPostJoinFilters()) {
        op = genFilterPlan(qb, condn, op, false);
        if (LOG.isDebugEnabled()) {
          LOG.debug("Generated " + op + " with post-filtering conditions after JOIN operator");
        }
      }
      return op;
    }

    return joinOp;
  }

  /**
   * Construct a selection operator for semijoin that filter out all fields
   * other than the group by keys.
   *
   * @param fields
   *          list of fields need to be output
   * @param input
   *          input operator
   * @return the selection operator.
   * @throws SemanticException
   */
  private Operator insertSelectForSemijoin(ArrayList fields,
      Operator input) throws SemanticException {

    RowResolver inputRR = opParseCtx.get(input).getRowResolver();
    ArrayList colList = new ArrayList();
    ArrayList outputColumnNames = new ArrayList();
    Map colExprMap = new HashMap();

    RowResolver outputRR = new RowResolver();

    // construct the list of columns that need to be projected
    for (int i = 0; i < fields.size(); ++i) {
      ASTNode field = fields.get(i);
      ExprNodeDesc exprNode = genExprNodeDesc(field, inputRR);
      String colName = getColumnInternalName(i);
      outputColumnNames.add(colName);
      ColumnInfo colInfo = new ColumnInfo(colName, exprNode.getTypeInfo(), "", false);
      outputRR.putExpression(field, colInfo);
      colList.add(exprNode);
      colExprMap.put(colName, exprNode);
    }

    // create selection operator
    Operator output = putOpInsertMap(OperatorFactory.getAndMakeChild(
        new SelectDesc(colList, outputColumnNames, false),
        new RowSchema(outputRR.getColumnInfos()), input), outputRR);

    output.setColumnExprMap(colExprMap);
    return output;
  }

  private Operator genMapGroupByForSemijoin(QB qb, ArrayList fields, // the
      // ASTNode
      // of
      // the
      // join
      // key
      // "tab.col"
      Operator inputOperatorInfo, GroupByDesc.Mode mode)
      throws SemanticException {

    RowResolver groupByInputRowResolver = opParseCtx.get(inputOperatorInfo)
        .getRowResolver();
    RowResolver groupByOutputRowResolver = new RowResolver();
    ArrayList groupByKeys = new ArrayList();
    ArrayList outputColumnNames = new ArrayList();
    ArrayList aggregations = new ArrayList();
    Map colExprMap = new HashMap();
    qb.getParseInfo();

    groupByOutputRowResolver.setIsExprResolver(true); // join keys should only
    // be columns but not be
    // expressions

    for (int i = 0; i < fields.size(); ++i) {
      // get the group by keys to ColumnInfo
      ASTNode colName = fields.get(i);
      ExprNodeDesc grpByExprNode = genExprNodeDesc(colName,
          groupByInputRowResolver);
      groupByKeys.add(grpByExprNode);

      // generate output column names
      String field = getColumnInternalName(i);
      outputColumnNames.add(field);
      ColumnInfo colInfo2 = new ColumnInfo(field, grpByExprNode.getTypeInfo(),
          "", false);
      groupByOutputRowResolver.putExpression(colName, colInfo2);

      // establish mapping from the output column to the input column
      colExprMap.put(field, grpByExprNode);
    }

    // Generate group-by operator
    float groupByMemoryUsage = HiveConf.getFloatVar(conf, HiveConf.ConfVars.HIVEMAPAGGRHASHMEMORY);
    float memoryThreshold = HiveConf
        .getFloatVar(conf, HiveConf.ConfVars.HIVEMAPAGGRMEMORYTHRESHOLD);
    Operator op = putOpInsertMap(OperatorFactory.getAndMakeChild(
        new GroupByDesc(mode, outputColumnNames, groupByKeys, aggregations,
            false, groupByMemoryUsage, memoryThreshold, null, false, -1, false),
        new RowSchema(groupByOutputRowResolver.getColumnInfos()),
        inputOperatorInfo), groupByOutputRowResolver);

    op.setColumnExprMap(colExprMap);
    return op;
  }

  private ExprNodeDesc[][] genJoinOperatorTypeCheck(ExprNodeDesc[][] keys)
      throws SemanticException {
    // keys[i] -> ArrayList for the i-th join operator key list
    int keyLength = 0;
    for (int i = 0; i < keys.length; i++) {
      if (i == 0) {
        keyLength = keys[i].length;
      } else {
        assert keyLength == keys[i].length;
      }
    }
    // implicit type conversion hierarchy
    for (int k = 0; k < keyLength; k++) {
      // Find the common class for type conversion
      TypeInfo commonType = keys[0][k].getTypeInfo();
      for (int i = 1; i < keys.length; i++) {
        TypeInfo a = commonType;
        TypeInfo b = keys[i][k].getTypeInfo();
        commonType = FunctionRegistry.getCommonClassForComparison(a, b);
        if (commonType == null) {
          throw new SemanticException(
              "Cannot do equality join on different types: " + a.getTypeName()
                  + " and " + b.getTypeName());
        }
      }
      // Add implicit type conversion if necessary
      for (int i = 0; i < keys.length; i++) {
        if (TypeInfoUtils.isConversionRequiredForComparison(
                keys[i][k].getTypeInfo(), commonType)) {
          keys[i][k] = ParseUtils.createConversionCast(
                  keys[i][k], (PrimitiveTypeInfo)commonType);
        } else {
          // For the case no implicit type conversion, e.g., varchar(5) and varchar(10),
          // pick the common type for all the keys since during run-time, same key type is assumed.
          keys[i][k].setTypeInfo(commonType);
        }
      }
    }
    return keys;
  }

  private Operator genJoinPlan(QB qb, Map map)
      throws SemanticException {
    QBJoinTree joinTree = qb.getQbJoinTree();
    Operator joinOp = genJoinOperator(qb, joinTree, map, null);
    return joinOp;
  }

  /**
   * Extract the filters from the join condition and push them on top of the
   * source operators. This procedure traverses the query tree recursively,
   */
  private void pushJoinFilters(QB qb, QBJoinTree joinTree,
      Map map) throws SemanticException {
    pushJoinFilters(qb, joinTree, map, true);
  }

  /**
   * Extract the filters from the join condition and push them on top of the
   * source operators. This procedure traverses the query tree recursively,
   */
  private void pushJoinFilters(QB qb, QBJoinTree joinTree,
      Map map,
      boolean recursively) throws SemanticException {
    if ( recursively ) {
      if (joinTree.getJoinSrc() != null) {
        pushJoinFilters(qb, joinTree.getJoinSrc(), map);
      }
    }
    ArrayList> filters = joinTree.getFiltersForPushing();
    int pos = 0;
    for (String src : joinTree.getBaseSrc()) {
      if (src != null) {
        Operator srcOp = map.get(src);
        ArrayList filter = filters.get(pos);
        for (ASTNode cond : filter) {
          srcOp = genFilterPlan(qb, cond, srcOp, false);
        }
        map.put(src, srcOp);
      }
      pos++;
    }
  }

  private List getMapSideJoinTables(QB qb) {
    List cols = new ArrayList();


    ASTNode hints = qb.getParseInfo().getHints();
    for (int pos = 0; pos < hints.getChildCount(); pos++) {
      ASTNode hint = (ASTNode) hints.getChild(pos);
      if (((ASTNode) hint.getChild(0)).getToken().getType() == HintParser.TOK_MAPJOIN) {
        // the user has specified to ignore mapjoin hint
        if (!conf.getBoolVar(HiveConf.ConfVars.HIVEIGNOREMAPJOINHINT)
            && !conf.getVar(HiveConf.ConfVars.HIVE_EXECUTION_ENGINE).equals("tez")) {
          ASTNode hintTblNames = (ASTNode) hint.getChild(1);
          int numCh = hintTblNames.getChildCount();
          for (int tblPos = 0; tblPos < numCh; tblPos++) {
            String tblName = ((ASTNode) hintTblNames.getChild(tblPos)).getText()
                .toLowerCase();
            if (!cols.contains(tblName)) {
              cols.add(tblName);
            }
          }
        }
        else {
          queryProperties.setMapJoinRemoved(true);
        }
      }
    }

    return cols;
  }

  // The join alias is modified before being inserted for consumption by sort-merge
  // join queries. If the join is part of a sub-query the alias is modified to include
  // the sub-query alias.
  private String getModifiedAlias(QB qb, String alias) {
    return QB.getAppendedAliasFromId(qb.getId(), alias);
  }

  private QBJoinTree genUniqueJoinTree(QB qb, ASTNode joinParseTree,
      Map aliasToOpInfo)
      throws SemanticException {
    QBJoinTree joinTree = new QBJoinTree();
    joinTree.setNoOuterJoin(false);

    joinTree.setExpressions(new ArrayList>());
    joinTree.setFilters(new ArrayList>());
    joinTree.setFiltersForPushing(new ArrayList>());

    // Create joinTree structures to fill them up later
    ArrayList rightAliases = new ArrayList();
    ArrayList leftAliases = new ArrayList();
    ArrayList baseSrc = new ArrayList();
    ArrayList preserved = new ArrayList();

    boolean lastPreserved = false;
    int cols = -1;

    for (int i = 0; i < joinParseTree.getChildCount(); i++) {
      ASTNode child = (ASTNode) joinParseTree.getChild(i);

      switch (child.getToken().getType()) {
      case HiveParser.TOK_TABREF:
        // Handle a table - populate aliases appropriately:
        // leftAliases should contain the first table, rightAliases should
        // contain all other tables and baseSrc should contain all tables

        String tableName = getUnescapedUnqualifiedTableName((ASTNode) child.getChild(0));

        String alias = child.getChildCount() == 1 ? tableName
            : unescapeIdentifier(child.getChild(child.getChildCount() - 1)
                .getText().toLowerCase());

        if (i == 0) {
          leftAliases.add(alias);
          joinTree.setLeftAlias(alias);
        } else {
          rightAliases.add(alias);
        }
        joinTree.getAliasToOpInfo().put(
            getModifiedAlias(qb, alias), aliasToOpInfo.get(alias));
        joinTree.setId(qb.getId());
        baseSrc.add(alias);

        preserved.add(lastPreserved);
        lastPreserved = false;
        break;

      case HiveParser.TOK_EXPLIST:
        if (cols == -1 && child.getChildCount() != 0) {
          cols = child.getChildCount();
        } else if (child.getChildCount() != cols) {
          throw new SemanticException("Tables with different or invalid "
              + "number of keys in UNIQUEJOIN");
        }

        ArrayList expressions = new ArrayList();
        ArrayList filt = new ArrayList();
        ArrayList filters = new ArrayList();

        for (Node exp : child.getChildren()) {
          expressions.add((ASTNode) exp);
        }

        joinTree.getExpressions().add(expressions);
        joinTree.getFilters().add(filt);
        joinTree.getFiltersForPushing().add(filters);
        break;

      case HiveParser.KW_PRESERVE:
        lastPreserved = true;
        break;

      case HiveParser.TOK_SUBQUERY:
        throw new SemanticException(
            "Subqueries are not supported in UNIQUEJOIN");

      default:
        throw new SemanticException("Unexpected UNIQUEJOIN structure");
      }
    }

    joinTree.setBaseSrc(baseSrc.toArray(new String[0]));
    joinTree.setLeftAliases(leftAliases.toArray(new String[0]));
    joinTree.setRightAliases(rightAliases.toArray(new String[0]));

    JoinCond[] condn = new JoinCond[preserved.size()];
    for (int i = 0; i < condn.length; i++) {
      condn[i] = new JoinCond(preserved.get(i));
    }
    joinTree.setJoinCond(condn);

    if ((qb.getParseInfo().getHints() != null)
        && !(conf.getVar(HiveConf.ConfVars.HIVE_EXECUTION_ENGINE).equals("tez"))) {
      LOG.info("STREAMTABLE hint honored.");
      parseStreamTables(joinTree, qb);
    }

    return joinTree;
  }

  /*
   * Setup a QBJoinTree between a SubQuery and its Parent Query. The Parent Query
   * is the lhs of the Join.
   *
   * The Parent Query is represented by the last Operator needed to process its From Clause.
   * In case of a single table Query this will be a TableScan, but it can be a Join Operator
   * if the Parent Query contains Join clauses, or in case of a single source from clause,
   * the source could be a SubQuery or a PTF invocation.
   *
   * We setup the QBJoinTree with the above constrains in place. So:
   * - the lhs of the QBJoinTree can be a another QBJoinTree if the Parent Query operator
   *   is a JoinOperator. In this case we get its QBJoinTree from the 'joinContext'
   * - the rhs is always a reference to the SubQuery. Its alias is obtained from the
   *   QBSubQuery object.
   *
   * The QBSubQuery also provides the Joining Condition AST. The Joining Condition has been
   * transformed in QBSubQuery setup, before this call. The Joining condition has any correlated
   * predicates and a predicate for joining the Parent Query expression with the SubQuery.
   *
   * The QBSubQuery also specifies what kind of Join to construct.
   *
   * Given this information, once we initialize the QBJoinTree, we call the 'parseJoinCondition'
   * method to validate and parse Join conditions.
   */
  private QBJoinTree genSQJoinTree(QB qb, ISubQueryJoinInfo subQuery,
      Operator joiningOp,
      Map aliasToOpInfo)
          throws SemanticException {
    QBJoinTree joinTree = new QBJoinTree();
    JoinCond[] condn = new JoinCond[1];

    switch (subQuery.getJoinType()) {
    case LEFTOUTER:
      joinTree.setNoOuterJoin(false);
      condn[0] = new JoinCond(0, 1, JoinType.LEFTOUTER);
      break;
    case RIGHTOUTER:
      joinTree.setNoOuterJoin(false);
      condn[0] = new JoinCond(0, 1, JoinType.RIGHTOUTER);
      break;
    case FULLOUTER:
      joinTree.setNoOuterJoin(false);
      condn[0] = new JoinCond(0, 1, JoinType.FULLOUTER);
      break;
    case LEFTSEMI:
      joinTree.setNoSemiJoin(false);
      condn[0] = new JoinCond(0, 1, JoinType.LEFTSEMI);
      break;
    default:
      condn[0] = new JoinCond(0, 1, JoinType.INNER);
      joinTree.setNoOuterJoin(true);
      break;
    }
    joinTree.setJoinCond(condn);

    if ( joiningOp instanceof JoinOperator ) {
      QBJoinTree leftTree = joinContext.get(joiningOp);
      joinTree.setJoinSrc(leftTree);
      String[] leftChildAliases = leftTree.getLeftAliases();
      String leftAliases[] = new String[leftChildAliases.length + 1];
      for (int i = 0; i < leftChildAliases.length; i++) {
        leftAliases[i] = leftChildAliases[i];
      }
      leftAliases[leftChildAliases.length] = leftTree.getRightAliases()[0];
      joinTree.setLeftAliases(leftAliases);
    } else {
      String alias = unescapeIdentifier(
          SubQueryUtils.getAlias(joiningOp, aliasToOpInfo).toLowerCase());
      joinTree.setLeftAlias(alias);
      String[] leftAliases = new String[1];
      leftAliases[0] = alias;
      joinTree.setLeftAliases(leftAliases);
      String[] children = new String[2];
      children[0] = alias;
      joinTree.setBaseSrc(children);
      joinTree.setId(qb.getId());
      joinTree.getAliasToOpInfo().put(
          getModifiedAlias(qb, alias), aliasToOpInfo.get(alias));
    }

    String rightalias = unescapeIdentifier(subQuery.getAlias().toLowerCase());
    String[] rightAliases = new String[1];
    rightAliases[0] = rightalias;
    joinTree.setRightAliases(rightAliases);
    String[] children = joinTree.getBaseSrc();
    if (children == null) {
      children = new String[2];
    }
    children[1] = rightalias;
    joinTree.setBaseSrc(children);
    joinTree.setId(qb.getId());
    joinTree.getAliasToOpInfo().put(
        getModifiedAlias(qb, rightalias), aliasToOpInfo.get(rightalias));
    // remember rhs table for semijoin
    if (joinTree.getNoSemiJoin() == false) {
      joinTree.addRHSSemijoin(rightalias);
    }

    ArrayList> expressions = new ArrayList>();
    expressions.add(new ArrayList());
    expressions.add(new ArrayList());
    joinTree.setExpressions(expressions);

    ArrayList nullsafes = new ArrayList();
    joinTree.setNullSafes(nullsafes);

    ArrayList> filters = new ArrayList>();
    filters.add(new ArrayList());
    filters.add(new ArrayList());
    joinTree.setFilters(filters);
    joinTree.setFilterMap(new int[2][]);

    ArrayList> filtersForPushing =
        new ArrayList>();
    filtersForPushing.add(new ArrayList());
    filtersForPushing.add(new ArrayList());
    joinTree.setFiltersForPushing(filtersForPushing);

    ASTNode joinCond = subQuery.getJoinConditionAST();
    ArrayList leftSrc = new ArrayList();
    parseJoinCondition(joinTree, joinCond, leftSrc, aliasToOpInfo);
    if (leftSrc.size() == 1) {
      joinTree.setLeftAlias(leftSrc.get(0));
    }

    return joinTree;
  }

  private QBJoinTree genJoinTree(QB qb, ASTNode joinParseTree,
      Map aliasToOpInfo)
      throws SemanticException {
    QBJoinTree joinTree = new QBJoinTree();
    JoinCond[] condn = new JoinCond[1];

    int joinType = joinParseTree.getToken().getType();
    switch (joinParseTree.getToken().getType()) {
    case HiveParser.TOK_LEFTOUTERJOIN:
      joinTree.setNoOuterJoin(false);
      condn[0] = new JoinCond(0, 1, JoinType.LEFTOUTER);
      break;
    case HiveParser.TOK_RIGHTOUTERJOIN:
      joinTree.setNoOuterJoin(false);
      condn[0] = new JoinCond(0, 1, JoinType.RIGHTOUTER);
      break;
    case HiveParser.TOK_FULLOUTERJOIN:
      joinTree.setNoOuterJoin(false);
      condn[0] = new JoinCond(0, 1, JoinType.FULLOUTER);
      break;
    case HiveParser.TOK_LEFTSEMIJOIN:
      joinTree.setNoSemiJoin(false);
      condn[0] = new JoinCond(0, 1, JoinType.LEFTSEMI);
      break;
    default:
      condn[0] = new JoinCond(0, 1, JoinType.INNER);
      joinTree.setNoOuterJoin(true);
      break;
    }

    joinTree.setJoinCond(condn);

    ASTNode left = (ASTNode) joinParseTree.getChild(0);
    ASTNode right = (ASTNode) joinParseTree.getChild(1);
    boolean isValidLeftToken = isValidJoinSide(left);
    boolean isJoinLeftToken = !isValidLeftToken && isJoinToken(left);
    boolean isValidRightToken = isValidJoinSide(right);
    boolean isJoinRightToken = !isValidRightToken && isJoinToken(right);
    // TODO: if we didn't care about the column order, we could switch join sides here
    //       for TOK_JOIN and TOK_FULLOUTERJOIN.
    if (!isValidLeftToken && !isJoinLeftToken) {
      throw new SemanticException("Invalid token on the left side of the join: "
          + left.getToken().getText() + "; please rewrite your query");
    } else if (!isValidRightToken) {
      String advice= "";
      if (isJoinRightToken && !isJoinLeftToken) {
        advice = "; for example, put the nested join on the left side, or nest joins differently";
      } else if (isJoinRightToken) {
        advice = "; for example, nest joins differently";
      }
      throw new SemanticException("Invalid token on the right side of the join: "
      + right.getToken().getText() + "; please rewrite your query" + advice);
    }

    if (isValidLeftToken) {
      String tableName = getUnescapedUnqualifiedTableName((ASTNode) left.getChild(0))
          .toLowerCase();
      String alias = extractJoinAlias(left, tableName);
      joinTree.setLeftAlias(alias);
      String[] leftAliases = new String[1];
      leftAliases[0] = alias;
      joinTree.setLeftAliases(leftAliases);
      String[] children = new String[2];
      children[0] = alias;
      joinTree.setBaseSrc(children);
      joinTree.setId(qb.getId());
      joinTree.getAliasToOpInfo().put(
          getModifiedAlias(qb, alias), aliasToOpInfo.get(alias));
    } else if (isJoinLeftToken) {
      QBJoinTree leftTree = genJoinTree(qb, left, aliasToOpInfo);
      joinTree.setJoinSrc(leftTree);
      String[] leftChildAliases = leftTree.getLeftAliases();
      String leftAliases[] = new String[leftChildAliases.length + 1];
      for (int i = 0; i < leftChildAliases.length; i++) {
        leftAliases[i] = leftChildAliases[i];
      }
      leftAliases[leftChildAliases.length] = leftTree.getRightAliases()[0];
      joinTree.setLeftAliases(leftAliases);
    } else {
      assert (false);
    }

    if (isValidRightToken) {
      String tableName = getUnescapedUnqualifiedTableName((ASTNode) right.getChild(0))
          .toLowerCase();
      String alias = extractJoinAlias(right, tableName);
      String[] rightAliases = new String[1];
      rightAliases[0] = alias;
      joinTree.setRightAliases(rightAliases);
      String[] children = joinTree.getBaseSrc();
      if (children == null) {
        children = new String[2];
      }
      children[1] = alias;
      joinTree.setBaseSrc(children);
      joinTree.setId(qb.getId());
      joinTree.getAliasToOpInfo().put(
          getModifiedAlias(qb, alias), aliasToOpInfo.get(alias));
      // remember rhs table for semijoin
      if (joinTree.getNoSemiJoin() == false) {
        joinTree.addRHSSemijoin(alias);
      }
    } else {
      assert false;
    }

    ArrayList> expressions = new ArrayList>();
    expressions.add(new ArrayList());
    expressions.add(new ArrayList());
    joinTree.setExpressions(expressions);

    ArrayList nullsafes = new ArrayList();
    joinTree.setNullSafes(nullsafes);

    ArrayList> filters = new ArrayList>();
    filters.add(new ArrayList());
    filters.add(new ArrayList());
    joinTree.setFilters(filters);
    joinTree.setFilterMap(new int[2][]);

    ArrayList> filtersForPushing =
        new ArrayList>();
    filtersForPushing.add(new ArrayList());
    filtersForPushing.add(new ArrayList());
    joinTree.setFiltersForPushing(filtersForPushing);

    ASTNode joinCond = (ASTNode) joinParseTree.getChild(2);
    ArrayList leftSrc = new ArrayList();
    parseJoinCondition(joinTree, joinCond, leftSrc, aliasToOpInfo);
    if (leftSrc.size() == 1) {
      joinTree.setLeftAlias(leftSrc.get(0));
    }

    // check the hints to see if the user has specified a map-side join. This
    // will be removed later on, once the cost-based
    // infrastructure is in place
    if (qb.getParseInfo().getHints() != null) {
      List mapSideTables = getMapSideJoinTables(qb);
      List mapAliases = joinTree.getMapAliases();

      for (String mapTbl : mapSideTables) {
        boolean mapTable = false;
        for (String leftAlias : joinTree.getLeftAliases()) {
          if (mapTbl.equalsIgnoreCase(leftAlias)) {
            mapTable = true;
          }
        }
        for (String rightAlias : joinTree.getRightAliases()) {
          if (mapTbl.equalsIgnoreCase(rightAlias)) {
            mapTable = true;
          }
        }

        if (mapTable) {
          if (mapAliases == null) {
            mapAliases = new ArrayList();
          }
          mapAliases.add(mapTbl);
          joinTree.setMapSideJoin(true);
        }
      }

      joinTree.setMapAliases(mapAliases);

      if ((conf.getVar(HiveConf.ConfVars.HIVE_EXECUTION_ENGINE).equals("tez")) == false) {
        parseStreamTables(joinTree, qb);
      }
    }

    return joinTree;
  }

  private static boolean isValidJoinSide(ASTNode right) {
    return (right.getToken().getType() == HiveParser.TOK_TABREF)
        || (right.getToken().getType() == HiveParser.TOK_SUBQUERY)
        || (right.getToken().getType() == HiveParser.TOK_PTBLFUNCTION);
  }

  private String extractJoinAlias(ASTNode node, String tableName) {
    // ptf node form is:
    // ^(TOK_PTBLFUNCTION $name $alias? partitionTableFunctionSource partitioningSpec? expression*)
    // guaranteed to have an alias here: check done in processJoin
    if (node.getType() == HiveParser.TOK_PTBLFUNCTION) {
      return unescapeIdentifier(node.getChild(1).getText().toLowerCase());
    }
    if (node.getChildCount() == 1) {
      return tableName;
    }
    for (int i = node.getChildCount() - 1; i >= 1; i--) {
      if (node.getChild(i).getType() == HiveParser.Identifier) {
        return unescapeIdentifier(node.getChild(i).getText().toLowerCase());
      }
    }
    return tableName;
  }

  private void parseStreamTables(QBJoinTree joinTree, QB qb) {
    List streamAliases = joinTree.getStreamAliases();

    for (Node hintNode : qb.getParseInfo().getHints().getChildren()) {
      ASTNode hint = (ASTNode) hintNode;
      if (hint.getChild(0).getType() == HintParser.TOK_STREAMTABLE) {
        for (int i = 0; i < hint.getChild(1).getChildCount(); i++) {
          if (streamAliases == null) {
            streamAliases = new ArrayList();
          }
          streamAliases.add(hint.getChild(1).getChild(i).getText());
        }
      }
    }

    joinTree.setStreamAliases(streamAliases);
  }

  /**
   * Merges node to target
   */
  private void mergeJoins(QB qb, QBJoinTree node, QBJoinTree target, int pos, int[] tgtToNodeExprMap) {
    String[] nodeRightAliases = node.getRightAliases();
    String[] trgtRightAliases = target.getRightAliases();
    String[] rightAliases = new String[nodeRightAliases.length
        + trgtRightAliases.length];

    for (int i = 0; i < trgtRightAliases.length; i++) {
      rightAliases[i] = trgtRightAliases[i];
    }
    for (int i = 0; i < nodeRightAliases.length; i++) {
      rightAliases[i + trgtRightAliases.length] = nodeRightAliases[i];
    }
    target.setRightAliases(rightAliases);
    target.getAliasToOpInfo().putAll(node.getAliasToOpInfo());

    String[] nodeBaseSrc = node.getBaseSrc();
    String[] trgtBaseSrc = target.getBaseSrc();
    String[] baseSrc = new String[nodeBaseSrc.length + trgtBaseSrc.length - 1];

    for (int i = 0; i < trgtBaseSrc.length; i++) {
      baseSrc[i] = trgtBaseSrc[i];
    }
    for (int i = 1; i < nodeBaseSrc.length; i++) {
      baseSrc[i + trgtBaseSrc.length - 1] = nodeBaseSrc[i];
    }
    target.setBaseSrc(baseSrc);

    ArrayList> expr = target.getExpressions();
    for (int i = 0; i < nodeRightAliases.length; i++) {
      List nodeConds = node.getExpressions().get(i + 1);
      ArrayList reordereNodeConds = new ArrayList();
      for(int k=0; k < tgtToNodeExprMap.length; k++) {
        reordereNodeConds.add(nodeConds.get(tgtToNodeExprMap[k]));
      }
      expr.add(reordereNodeConds);
    }

    ArrayList nns = node.getNullSafes();
    ArrayList tns = target.getNullSafes();
    for (int i = 0; i < tns.size(); i++) {
      tns.set(i, tns.get(i) & nns.get(i)); // any of condition contains non-NS, non-NS
    }

    ArrayList> filters = target.getFilters();
    for (int i = 0; i < nodeRightAliases.length; i++) {
      filters.add(node.getFilters().get(i + 1));
    }

    if (node.getFilters().get(0).size() != 0) {
      ArrayList filterPos = filters.get(pos);
      filterPos.addAll(node.getFilters().get(0));
    }

    int[][] nmap = node.getFilterMap();
    int[][] tmap = target.getFilterMap();
    int[][] newmap = new int[tmap.length + nmap.length - 1][];

    for (int[] mapping : nmap) {
      if (mapping != null) {
        for (int i = 0; i < mapping.length; i += 2) {
          if (pos > 0 || mapping[i] > 0) {
            mapping[i] += trgtRightAliases.length;
          }
        }
      }
    }
    if (nmap[0] != null) {
      if (tmap[pos] == null) {
        tmap[pos] = nmap[0];
      } else {
        int[] appended = new int[tmap[pos].length + nmap[0].length];
        System.arraycopy(tmap[pos], 0, appended, 0, tmap[pos].length);
        System.arraycopy(nmap[0], 0, appended, tmap[pos].length, nmap[0].length);
        tmap[pos] = appended;
      }
    }
    System.arraycopy(tmap, 0, newmap, 0, tmap.length);
    System.arraycopy(nmap, 1, newmap, tmap.length, nmap.length - 1);
    target.setFilterMap(newmap);

    ArrayList> filter = target.getFiltersForPushing();
    for (int i = 0; i < nodeRightAliases.length; i++) {
      filter.add(node.getFiltersForPushing().get(i + 1));
    }

    if (node.getFiltersForPushing().get(0).size() != 0) {
      /*
       * for each predicate:
       * - does it refer to one or many aliases
       * - if one: add it to the filterForPushing list of that alias
       * - if many: add as a filter from merging trees.
       */

      for(ASTNode nodeFilter : node.getFiltersForPushing().get(0) ) {
        int fPos = ParseUtils.checkJoinFilterRefersOneAlias(target.getBaseSrc(), nodeFilter);

        if ( fPos != - 1 ) {
          filter.get(fPos).add(nodeFilter);
        } else {
          target.addPostJoinFilter(nodeFilter);
        }
      }
     }

    if (node.getNoOuterJoin() && target.getNoOuterJoin()) {
      target.setNoOuterJoin(true);
    } else {
      target.setNoOuterJoin(false);
    }

    if (node.getNoSemiJoin() && target.getNoSemiJoin()) {
      target.setNoSemiJoin(true);
    } else {
      target.setNoSemiJoin(false);
    }

    target.mergeRHSSemijoin(node);

    JoinCond[] nodeCondns = node.getJoinCond();
    int nodeCondnsSize = nodeCondns.length;
    JoinCond[] targetCondns = target.getJoinCond();
    int targetCondnsSize = targetCondns.length;
    JoinCond[] newCondns = new JoinCond[nodeCondnsSize + targetCondnsSize];
    for (int i = 0; i < targetCondnsSize; i++) {
      newCondns[i] = targetCondns[i];
    }

    for (int i = 0; i < nodeCondnsSize; i++) {
      JoinCond nodeCondn = nodeCondns[i];
      if (nodeCondn.getLeft() == 0) {
        nodeCondn.setLeft(pos);
      } else {
        nodeCondn.setLeft(nodeCondn.getLeft() + targetCondnsSize);
      }
      nodeCondn.setRight(nodeCondn.getRight() + targetCondnsSize);
      newCondns[targetCondnsSize + i] = nodeCondn;
    }

    target.setJoinCond(newCondns);
    if (target.isMapSideJoin()) {
      assert node.isMapSideJoin();
      List mapAliases = target.getMapAliases();
      for (String mapTbl : node.getMapAliases()) {
        if (!mapAliases.contains(mapTbl)) {
          mapAliases.add(mapTbl);
        }
      }
      target.setMapAliases(mapAliases);
    }

    if (node.getPostJoinFilters().size() != 0) {
      // Safety check: if we are merging join operators and there are post-filtering
      // conditions, they cannot be outer joins
      assert node.getNoOuterJoin() ;
      if( target.getPostJoinFilters().size() != 0) {
        assert target.getNoOuterJoin() ;
      }
      for (ASTNode exprPostFilter : node.getPostJoinFilters()) {
        target.addPostJoinFilter(exprPostFilter);
      }
    }
  }

  private ObjectPair findMergePos(QBJoinTree node, QBJoinTree target) {
    int res = -1;
    String leftAlias = node.getLeftAlias();
    if (leftAlias == null && (!node.getNoOuterJoin() || !target.getNoOuterJoin())) {
      // Cross with outer join: currently we do not merge
      return new ObjectPair(-1, null);
    }

    ArrayList nodeCondn = node.getExpressions().get(0);
    ArrayList targetCondn = null;

    if (leftAlias == null || leftAlias.equals(target.getLeftAlias())) {
      targetCondn = target.getExpressions().get(0);
      res = 0;
    } else {
      for (int i = 0; i < target.getRightAliases().length; i++) {
        if (leftAlias.equals(target.getRightAliases()[i])) {
          targetCondn = target.getExpressions().get(i + 1);
          res = i + 1;
          break;
        }
      }
    }

    if ( targetCondn == null || (nodeCondn.size() != targetCondn.size())) {
      return new ObjectPair(-1, null);
    }

    /*
     * The order of the join condition expressions don't matter.
     * A merge can happen:
     * - if every target condition is present in some position of the node condition list.
     * - there is no node condition, which is not equal to any target condition.
     */

    int[] tgtToNodeExprMap = new int[targetCondn.size()];
    boolean[] nodeFiltersMapped = new boolean[nodeCondn.size()];
    int i, j;
    for(i=0; i inner most(n)
    List trees = new ArrayList();
    for (;tree != null; tree = tree.getJoinSrc()) {
      trees.add(tree);
    }

    // merging from 'target'(inner) to 'node'(outer)
    boolean mergedQBJTree = false;
    for (int i = trees.size() - 1; i >= 0; i--) {
      QBJoinTree target = trees.get(i);
      if (target == null) {
        continue;
      }
      JoinType prevType = null;   // save join type
      boolean continueScanning = true;
      for (int j = i - 1; j >= 0 && continueScanning; j--) {
        QBJoinTree node = trees.get(j);
        if (node == null) {
          continue;
        }
        JoinType currType = getType(node.getJoinCond());
        if (prevType != null && prevType != currType) {
          break;
        }
        if ((!node.getNoOuterJoin() && node.getPostJoinFilters().size() != 0) ||
                (!target.getNoOuterJoin() && target.getPostJoinFilters().size() != 0)) {
          // Outer joins with post-filtering conditions cannot be merged
          break;
        }
        ObjectPair mergeDetails = findMergePos(node, target);
        int pos = mergeDetails.getFirst();
        if (pos >= 0) {
          // for outer joins, it should not exceed 16 aliases (short type)
          if (!node.getNoOuterJoin() || !target.getNoOuterJoin()) {
            if (node.getRightAliases().length + target.getRightAliases().length + 1 > 16) {
              LOG.info(ErrorMsg.JOINNODE_OUTERJOIN_MORETHAN_16.getErrorCodedMsg());
              continueScanning = continueJoinMerge();
              continue;
            }
          }
          mergeJoins(qb, node, target, pos, mergeDetails.getSecond());
          trees.set(j, null);
          mergedQBJTree = true;
          continue; // continue merging with next alias
        }
        /*
         * for CBO provided orderings, don't attempt to reorder joins.
         * only convert consecutive joins into n-way joins.
         */
        continueScanning = continueJoinMerge();
        if (prevType == null) {
          prevType = currType;
        }
      }
    }

    // Now that we reordered QBJoinTrees, update leftaliases of all
    // QBJoinTree from innermost to outer
    if ((trees.size() > 1) && mergedQBJTree) {
      QBJoinTree curQBJTree = null;
      QBJoinTree prevQBJTree = null;
      for (int i = trees.size() - 1; i >= 0; i--) {
        curQBJTree = trees.get(i);
        if (curQBJTree != null) {
          if (prevQBJTree != null) {
            ArrayList newCurLeftAliases = new ArrayList();
            newCurLeftAliases.addAll(Arrays.asList(prevQBJTree.getLeftAliases()));
            newCurLeftAliases.addAll(Arrays.asList(prevQBJTree.getRightAliases()));
            curQBJTree
                .setLeftAliases(newCurLeftAliases.toArray(new String[newCurLeftAliases.size()]));
          }
          prevQBJTree = curQBJTree;
        }
      }
    }

    // reconstruct join tree
    QBJoinTree current = null;
    for (int i = 0; i < trees.size(); i++) {
      QBJoinTree target = trees.get(i);
      if (target == null) {
        continue;
      }
      if (current == null) {
        qb.setQbJoinTree(current = target);
      } else {
        current.setJoinSrc(target);
        current = target;
      }
    }
  }

  // Join types should be all the same for merging (or returns null)
  private JoinType getType(JoinCond[] conds) {
    JoinType type = conds[0].getJoinType();
    for (int k = 1; k < conds.length; k++) {
      if (type != conds[k].getJoinType()) {
        return null;
      }
    }
    return type;
  }

  private Operator genSelectAllDesc(Operator input) throws SemanticException {
    OpParseContext inputCtx = opParseCtx.get(input);
    RowResolver inputRR = inputCtx.getRowResolver();
    ArrayList columns = inputRR.getColumnInfos();
    ArrayList colList = new ArrayList();
    ArrayList columnNames = new ArrayList();
    Map columnExprMap =
        new HashMap();
    for (int i = 0; i < columns.size(); i++) {
      ColumnInfo col = columns.get(i);
      colList.add(new ExprNodeColumnDesc(col, true));
      columnNames.add(col.getInternalName());
      columnExprMap.put(col.getInternalName(), new ExprNodeColumnDesc(col, true));
    }
    RowResolver outputRR = inputRR.duplicate();
    Operator output = putOpInsertMap(OperatorFactory.getAndMakeChild(
        new SelectDesc(colList, columnNames, true),
        outputRR.getRowSchema(), input), outputRR);
    output.setColumnExprMap(columnExprMap);
    return output;
  }

  // Groups the clause names into lists so that any two clauses in the same list has the same
  // group by and distinct keys and no clause appears in more than one list. Returns a list of the
  // lists of clauses.
  private List> getCommonGroupByDestGroups(QB qb,
      Map> inputs) throws SemanticException {

    QBParseInfo qbp = qb.getParseInfo();

    TreeSet ks = new TreeSet();
    ks.addAll(qbp.getClauseNames());

    List> commonGroupByDestGroups = new ArrayList>();

    // If this is a trivial query block return
    if (ks.size() <= 1) {
      List oneList = new ArrayList(1);
      if (ks.size() == 1) {
        oneList.add(ks.first());
      }
      commonGroupByDestGroups.add(oneList);
      return commonGroupByDestGroups;
    }

    List> inputOperators =
        new ArrayList>(ks.size());
    List> sprayKeyLists = new ArrayList>(ks.size());
    List> distinctKeyLists = new ArrayList>(ks.size());

    // Iterate over each clause
    for (String dest : ks) {
      Operator input = inputs.get(dest);
      RowResolver inputRR = opParseCtx.get(input).getRowResolver();

      List distinctKeys = getDistinctExprs(qbp, dest, inputRR);
      List sprayKeys = new ArrayList();

      // Add the group by expressions
      List grpByExprs = getGroupByForClause(qbp, dest);
      for (ASTNode grpByExpr : grpByExprs) {
        ExprNodeDesc exprDesc = genExprNodeDesc(grpByExpr, inputRR);
        if (ExprNodeDescUtils.indexOf(exprDesc, sprayKeys) < 0) {
          sprayKeys.add(exprDesc);
        }
      }

      // Loop through each of the lists of exprs, looking for a match
      boolean found = false;
      for (int i = 0; i < sprayKeyLists.size(); i++) {
        if (!input.equals(inputOperators.get(i))) {
          continue;
        }

        if (distinctKeys.isEmpty()) {
          // current dest has no distinct keys.
          List combinedList = new ArrayList();
          combineExprNodeLists(sprayKeyLists.get(i), distinctKeyLists.get(i), combinedList);
          if (!matchExprLists(combinedList, sprayKeys)) {
            continue;
          } // else do the common code at the end.
        } else {
          if (distinctKeyLists.get(i).isEmpty()) {
            List combinedList = new ArrayList();
            combineExprNodeLists(sprayKeys, distinctKeys, combinedList);
            if (!matchExprLists(combinedList, sprayKeyLists.get(i))) {
              continue;
            } else {
              // we have found a match. insert this distinct clause to head.
              distinctKeyLists.remove(i);
              sprayKeyLists.remove(i);
              distinctKeyLists.add(i, distinctKeys);
              sprayKeyLists.add(i, sprayKeys);
              commonGroupByDestGroups.get(i).add(0, dest);
              found = true;
              break;
            }
          } else {
            if (!matchExprLists(distinctKeyLists.get(i), distinctKeys)) {
              continue;
            }

            if (!matchExprLists(sprayKeyLists.get(i), sprayKeys)) {
              continue;
            }
            // else do common code
          }
        }

        // common code
        // A match was found, so add the clause to the corresponding list
        commonGroupByDestGroups.get(i).add(dest);
        found = true;
        break;
      }

      // No match was found, so create new entries
      if (!found) {
        inputOperators.add(input);
        sprayKeyLists.add(sprayKeys);
        distinctKeyLists.add(distinctKeys);
        List destGroup = new ArrayList();
        destGroup.add(dest);
        commonGroupByDestGroups.add(destGroup);
      }
    }

    return commonGroupByDestGroups;
  }

  private void combineExprNodeLists(List list, List list2,
      List combinedList) {
    combinedList.addAll(list);
    for (ExprNodeDesc elem : list2) {
      if (!combinedList.contains(elem)) {
        combinedList.add(elem);
      }
    }
  }

  // Returns whether or not two lists contain the same elements independent of order
  private boolean matchExprLists(List list1, List list2) {

    if (list1.size() != list2.size()) {
      return false;
    }
    for (ExprNodeDesc exprNodeDesc : list1) {
      if (ExprNodeDescUtils.indexOf(exprNodeDesc, list2) < 0) {
        return false;
      }
    }

    return true;
  }

  // Returns a list of the distinct exprs without duplicates for a given clause name
  private List getDistinctExprs(QBParseInfo qbp, String dest, RowResolver inputRR)
      throws SemanticException {

    List distinctAggExprs = qbp.getDistinctFuncExprsForClause(dest);
    List distinctExprs = new ArrayList();

    for (ASTNode distinctAggExpr : distinctAggExprs) {
      // 0 is function name
      for (int i = 1; i < distinctAggExpr.getChildCount(); i++) {
        ASTNode parameter = (ASTNode) distinctAggExpr.getChild(i);
        ExprNodeDesc expr = genExprNodeDesc(parameter, inputRR);
        if (ExprNodeDescUtils.indexOf(expr, distinctExprs) < 0) {
          distinctExprs.add(expr);
        }
      }
    }

    return distinctExprs;
  }

  @SuppressWarnings("nls")
  private Operator genBodyPlan(QB qb, Operator input, Map aliasToOpInfo)
      throws SemanticException {
    QBParseInfo qbp = qb.getParseInfo();

    TreeSet ks = new TreeSet(qbp.getClauseNames());
    Map> inputs = createInputForDests(qb, input, ks);

    Operator curr = input;

    List> commonGroupByDestGroups = null;

    // If we can put multiple group bys in a single reducer, determine suitable groups of
    // expressions, otherwise treat all the expressions as a single group
    if (conf.getBoolVar(HiveConf.ConfVars.HIVEMULTIGROUPBYSINGLEREDUCER)) {
      try {
        commonGroupByDestGroups = getCommonGroupByDestGroups(qb, inputs);
      } catch (SemanticException e) {
        LOG.error("Failed to group clauses by common spray keys.", e);
      }
    }

    if (commonGroupByDestGroups == null) {
      commonGroupByDestGroups = new ArrayList>();
      commonGroupByDestGroups.add(new ArrayList(ks));
    }

    if (!commonGroupByDestGroups.isEmpty()) {

      // Iterate over each group of subqueries with the same group by/distinct keys
      for (List commonGroupByDestGroup : commonGroupByDestGroups) {
        if (commonGroupByDestGroup.isEmpty()) {
          continue;
        }

        String firstDest = commonGroupByDestGroup.get(0);
        input = inputs.get(firstDest);

        // Constructs a standard group by plan if:
        // There is no other subquery with the same group by/distinct keys or
        // (There are no aggregations in a representative query for the group and
        // There is no group by in that representative query) or
        // The data is skewed or
        // The conf variable used to control combining group bys into a single reducer is false
        if (commonGroupByDestGroup.size() == 1 ||
            (qbp.getAggregationExprsForClause(firstDest).size() == 0 &&
            getGroupByForClause(qbp, firstDest).size() == 0) ||
            conf.getBoolVar(HiveConf.ConfVars.HIVEGROUPBYSKEW) ||
            !conf.getBoolVar(HiveConf.ConfVars.HIVEMULTIGROUPBYSINGLEREDUCER)) {

          // Go over all the destination tables
          for (String dest : commonGroupByDestGroup) {
            curr = inputs.get(dest);

            if (qbp.getWhrForClause(dest) != null) {
              ASTNode whereExpr = qb.getParseInfo().getWhrForClause(dest);
              curr = genFilterPlan((ASTNode) whereExpr.getChild(0), qb, curr, aliasToOpInfo, false, false);
            }
            // Preserve operator before the GBY - we'll use it to resolve '*'
            Operator gbySource = curr;

            if ((qbp.getAggregationExprsForClause(dest).size() != 0
                || getGroupByForClause(qbp, dest).size() > 0)
                    && (qbp.getSelForClause(dest).getToken().getType() != HiveParser.TOK_SELECTDI
                      || qbp.getWindowingExprsForClause(dest) == null)) {
              // multiple distincts is not supported with skew in data
              if (conf.getBoolVar(HiveConf.ConfVars.HIVEGROUPBYSKEW) &&
                  qbp.getDistinctFuncExprsForClause(dest).size() > 1) {
                throw new SemanticException(ErrorMsg.UNSUPPORTED_MULTIPLE_DISTINCTS.
                    getMsg());
              }
              // insert a select operator here used by the ColumnPruner to reduce
              // the data to shuffle
              curr = genSelectAllDesc(curr);
              // Check and transform group by *. This will only happen for select distinct *.
              // Here the "genSelectPlan" is being leveraged.
              // The main benefits are (1) remove virtual columns that should
              // not be included in the group by; (2) add the fully qualified column names to unParseTranslator
              // so that view is supported. The drawback is that an additional SEL op is added. If it is
              // not necessary, it will be removed by NonBlockingOpDeDupProc Optimizer because it will match
              // SEL%SEL% rule.
              ASTNode selExprList = qbp.getSelForClause(dest);
              if (selExprList.getToken().getType() == HiveParser.TOK_SELECTDI
                  && selExprList.getChildCount() == 1 && selExprList.getChild(0).getChildCount() == 1) {
                ASTNode node = (ASTNode) selExprList.getChild(0).getChild(0);
                if (node.getToken().getType() == HiveParser.TOK_ALLCOLREF) {
                  curr = genSelectPlan(dest, qb, curr, curr);
                  RowResolver rr = opParseCtx.get(curr).getRowResolver();
                  qbp.setSelExprForClause(dest, SemanticAnalyzer.genSelectDIAST(rr));
                }
              }
              if (conf.getBoolVar(HiveConf.ConfVars.HIVEMAPSIDEAGGREGATE)) {
                if (!conf.getBoolVar(HiveConf.ConfVars.HIVEGROUPBYSKEW)) {
                  curr = genGroupByPlanMapAggrNoSkew(dest, qb, curr);
                } else {
                  curr = genGroupByPlanMapAggr2MR(dest, qb, curr);
                }
              } else if (conf.getBoolVar(HiveConf.ConfVars.HIVEGROUPBYSKEW)) {
                curr = genGroupByPlan2MR(dest, qb, curr);
              } else {
                curr = genGroupByPlan1MR(dest, qb, curr);
              }
            }
            if (LOG.isDebugEnabled()) {
              LOG.debug("RR before GB " + opParseCtx.get(gbySource).getRowResolver()
                  + " after GB " + opParseCtx.get(curr).getRowResolver());
            }

            curr = genPostGroupByBodyPlan(curr, dest, qb, aliasToOpInfo, gbySource);
          }
        } else {
          curr = genGroupByPlan1ReduceMultiGBY(commonGroupByDestGroup, qb, input, aliasToOpInfo);
        }
      }
    }


    if (LOG.isDebugEnabled()) {
      LOG.debug("Created Body Plan for Query Block " + qb.getId());
    }

    return curr;
  }

  private Map> createInputForDests(QB qb,
      Operator input, Set dests) throws SemanticException {
    Map> inputs =
        new HashMap>();
    for (String dest : dests) {
      inputs.put(dest, genLateralViewPlanForDest(dest, qb, input));
    }
    return inputs;
  }

  private Operator genPostGroupByBodyPlan(Operator curr, String dest, QB qb,
      Map aliasToOpInfo, Operator gbySource)
      throws SemanticException {

    QBParseInfo qbp = qb.getParseInfo();

    // Insert HAVING plan here
    if (qbp.getHavingForClause(dest) != null) {
      if (getGroupByForClause(qbp, dest).size() == 0) {
        throw new SemanticException("HAVING specified without GROUP BY");
      }
      curr = genHavingPlan(dest, qb, curr, aliasToOpInfo);
    }

    if(queryProperties.hasWindowing() && qb.getWindowingSpec(dest) != null) {
      curr = genWindowingPlan(qb, qb.getWindowingSpec(dest), curr);
      // GBy for DISTINCT after windowing
      if ((qbp.getAggregationExprsForClause(dest).size() != 0
              || getGroupByForClause(qbp, dest).size() > 0)
                  && qbp.getSelForClause(dest).getToken().getType() == HiveParser.TOK_SELECTDI
                  && qbp.getWindowingExprsForClause(dest) != null) {
        if (conf.getBoolVar(HiveConf.ConfVars.HIVEMAPSIDEAGGREGATE)) {
          if (!conf.getBoolVar(HiveConf.ConfVars.HIVEGROUPBYSKEW)) {
            curr = genGroupByPlanMapAggrNoSkew(dest, qb, curr);
          } else {
            curr = genGroupByPlanMapAggr2MR(dest, qb, curr);
          }
        } else if (conf.getBoolVar(HiveConf.ConfVars.HIVEGROUPBYSKEW)) {
          curr = genGroupByPlan2MR(dest, qb, curr);
        } else {
          curr = genGroupByPlan1MR(dest, qb, curr);
        }
      }
    }

    curr = genSelectPlan(dest, qb, curr, gbySource);

    Integer limit = qbp.getDestLimit(dest);
    Integer offset = (qbp.getDestLimitOffset(dest) == null) ? 0 : qbp.getDestLimitOffset(dest);

    // Expressions are not supported currently without a alias.

    // Reduce sink is needed if the query contains a cluster by, distribute by,
    // order by or a sort by clause.
    boolean genReduceSink = false;
    boolean hasOrderBy = false;

    // Currently, expressions are not allowed in cluster by, distribute by,
    // order by or a sort by clause. For each of the above clause types, check
    // if the clause contains any expression.
    if (qbp.getClusterByForClause(dest) != null) {
      genReduceSink = true;
    }

    if (qbp.getDistributeByForClause(dest) != null) {
      genReduceSink = true;
    }

    if (qbp.getOrderByForClause(dest) != null) {
      genReduceSink = true;
      hasOrderBy = true;
    }

    if (qbp.getSortByForClause(dest) != null) {
      genReduceSink = true;
    }

    if (genReduceSink) {
      int numReducers = -1;

      // Use only 1 reducer if order by is present
      if (hasOrderBy) {
        numReducers = 1;
      }

      curr = genReduceSinkPlan(dest, qb, curr, numReducers, hasOrderBy);
    }


    if (qbp.getIsSubQ()) {
      if (limit != null) {
        // In case of order by, only 1 reducer is used, so no need of
        // another shuffle
        curr = genLimitMapRedPlan(dest, qb, curr, offset.intValue(),
            limit.intValue(), !hasOrderBy);
      }
    } else {
      // exact limit can be taken care of by the fetch operator
      if (limit != null) {
        boolean extraMRStep = true;

        if (hasOrderBy ||
            qb.getIsQuery() && qbp.getClusterByForClause(dest) == null &&
            qbp.getSortByForClause(dest) == null) {
          extraMRStep = false;
        }

        curr = genLimitMapRedPlan(dest, qb, curr, offset.intValue(),
            limit.intValue(), extraMRStep);
        qb.getParseInfo().setOuterQueryLimit(limit.intValue());
      }
      if (!queryState.getHiveOperation().equals(HiveOperation.CREATEVIEW)) {
        curr = genFileSinkPlan(dest, qb, curr);
      }
    }

    return curr;
  }

  @SuppressWarnings("nls")
  private Operator genUnionPlan(String unionalias, String leftalias,
      Operator leftOp, String rightalias, Operator rightOp)
      throws SemanticException {

    // Currently, the unions are not merged - each union has only 2 parents. So,
    // a n-way union will lead to (n-1) union operators.
    // This can be easily merged into 1 union
    RowResolver leftRR = opParseCtx.get(leftOp).getRowResolver();
    RowResolver rightRR = opParseCtx.get(rightOp).getRowResolver();
    LinkedHashMap leftmap = leftRR.getFieldMap(leftalias);
    LinkedHashMap rightmap = rightRR.getFieldMap(rightalias);
    // make sure the schemas of both sides are the same
    ASTNode tabref = qb.getAliases().isEmpty() ? null :
        qb.getParseInfo().getSrcForAlias(qb.getAliases().get(0));
    if (leftmap.size() != rightmap.size()) {
      throw new SemanticException("Schema of both sides of union should match.");
    }

    RowResolver unionoutRR = new RowResolver();

    Iterator> lIter = leftmap.entrySet().iterator();
    Iterator> rIter = rightmap.entrySet().iterator();
    while (lIter.hasNext()) {
      Map.Entry lEntry = lIter.next();
      Map.Entry rEntry = rIter.next();
      ColumnInfo lInfo = lEntry.getValue();
      ColumnInfo rInfo = rEntry.getValue();

      String field = lEntry.getKey(); // use left alias (~mysql, postgresql)
      // try widening conversion, otherwise fail union
      TypeInfo commonTypeInfo = FunctionRegistry.getCommonClassForUnionAll(lInfo.getType(),
          rInfo.getType());
      if (commonTypeInfo == null) {
        throw new SemanticException(generateErrorMessage(tabref,
            "Schema of both sides of union should match: Column " + field
                + " is of type " + lInfo.getType().getTypeName()
                + " on first table and type " + rInfo.getType().getTypeName()
                + " on second table"));
      }
      ColumnInfo unionColInfo = new ColumnInfo(lInfo);
      unionColInfo.setType(commonTypeInfo);
      unionoutRR.put(unionalias, field, unionColInfo);
    }

    // For Spark,TEZ we rely on the generated SelectOperator to do the type casting.
    // Consider:
    //    SEL_1 (int)   SEL_2 (int)    SEL_3 (double)
    // If we first merge SEL_1 and SEL_2 into a UNION_1, and then merge UNION_1
    // with SEL_3 to get UNION_2, then no SelectOperator will be inserted. Hence error
    // will happen afterwards. The solution here is to insert one after UNION_1, which
    // cast int to double.
    boolean isMR = HiveConf.getVar(conf,
        HiveConf.ConfVars.HIVE_EXECUTION_ENGINE).equals("mr");

    if (!isMR || !(leftOp instanceof UnionOperator)) {
      leftOp = genInputSelectForUnion(leftOp, leftmap, leftalias, unionoutRR, unionalias);
    }

    if (!isMR || !(rightOp instanceof UnionOperator)) {
      rightOp = genInputSelectForUnion(rightOp, rightmap, rightalias, unionoutRR, unionalias);
    }

    // If one of the children (left or right) is:
    // (i) a union, or
    // (ii) an identity projection followed by a union,
    // merge with it
    // else create a new one
    if (leftOp instanceof UnionOperator ||
        (leftOp instanceof SelectOperator &&
         leftOp.getParentOperators() != null &&
         !leftOp.getParentOperators().isEmpty() &&
         leftOp.getParentOperators().get(0) instanceof UnionOperator &&
         ((SelectOperator)leftOp).isIdentitySelect()) ) {

      if(!(leftOp instanceof UnionOperator)) {
        Operator oldChild = leftOp;
        leftOp = (Operator) leftOp.getParentOperators().get(0);
        leftOp.removeChildAndAdoptItsChildren(oldChild);
      }

      // make left a child of right
      List> child =
          new ArrayList>();
      child.add(leftOp);
      rightOp.setChildOperators(child);

      List> parent = leftOp
          .getParentOperators();
      parent.add(rightOp);

      UnionDesc uDesc = ((UnionOperator) leftOp).getConf();
      uDesc.setNumInputs(uDesc.getNumInputs() + 1);
      return putOpInsertMap(leftOp, unionoutRR);
    }

    if (rightOp instanceof UnionOperator ||
        (rightOp instanceof SelectOperator &&
         rightOp.getParentOperators() != null &&
         !rightOp.getParentOperators().isEmpty() &&
         rightOp.getParentOperators().get(0) instanceof UnionOperator &&
         ((SelectOperator)rightOp).isIdentitySelect()) ) {

      if(!(rightOp instanceof UnionOperator)) {
        Operator oldChild = rightOp;
        rightOp = (Operator) rightOp.getParentOperators().get(0);
        rightOp.removeChildAndAdoptItsChildren(oldChild);
      }

      // make right a child of left
      List> child =
          new ArrayList>();
      child.add(rightOp);
      leftOp.setChildOperators(child);

      List> parent = rightOp
          .getParentOperators();
      parent.add(leftOp);
      UnionDesc uDesc = ((UnionOperator) rightOp).getConf();
      uDesc.setNumInputs(uDesc.getNumInputs() + 1);

      return putOpInsertMap(rightOp, unionoutRR);
    }

    // Create a new union operator
    Operator unionforward = OperatorFactory
        .getAndMakeChild(getOpContext(), new UnionDesc(), new RowSchema(unionoutRR
            .getColumnInfos()));

    // set union operator as child of each of leftOp and rightOp
    List> child =
        new ArrayList>();
    child.add(unionforward);
    rightOp.setChildOperators(child);

    child = new ArrayList>();
    child.add(unionforward);
    leftOp.setChildOperators(child);

    List> parent =
        new ArrayList>();
    parent.add(leftOp);
    parent.add(rightOp);
    unionforward.setParentOperators(parent);

    // create operator info list to return
    return putOpInsertMap(unionforward, unionoutRR);
  }

  /**
   * Generates a select operator which can go between the original input operator and the union
   * operator. This select casts columns to match the type of the associated column in the union,
   * other columns pass through unchanged. The new operator's only parent is the original input
   * operator to the union, and it's only child is the union. If the input does not need to be
   * cast, the original operator is returned, and no new select operator is added.
   *
   * @param origInputOp
   *          The original input operator to the union.
   * @param origInputFieldMap
   *          A map from field name to ColumnInfo for the original input operator.
   * @param origInputAlias
   *          The alias associated with the original input operator.
   * @param unionoutRR
   *          The union's output row resolver.
   * @param unionalias
   *          The alias of the union.
   * @return
   * @throws SemanticException
   */
  private Operator genInputSelectForUnion(
      Operator origInputOp, Map origInputFieldMap,
      String origInputAlias, RowResolver unionoutRR, String unionalias)
      throws SemanticException {

    HashMap fieldMap = unionoutRR.getFieldMap(unionalias);

    Iterator oIter = origInputFieldMap.values().iterator();
    Iterator uIter = fieldMap.values().iterator();

    List columns = new ArrayList();
    boolean needsCast = false;
    while (oIter.hasNext()) {
      ColumnInfo oInfo = oIter.next();
      ColumnInfo uInfo = uIter.next();
      ExprNodeDesc column = new ExprNodeColumnDesc(oInfo.getType(), oInfo.getInternalName(),
          oInfo.getTabAlias(), oInfo.getIsVirtualCol(), oInfo.isSkewedCol());
      if (!oInfo.getType().equals(uInfo.getType())) {
        needsCast = true;
        column = ParseUtils.createConversionCast(
            column, (PrimitiveTypeInfo)uInfo.getType());
      }
      columns.add(column);
    }

    // If none of the columns need to be cast there's no need for an additional select operator
    if (!needsCast) {
      return origInputOp;
    }

    RowResolver rowResolver = new RowResolver();
    Map columnExprMap = new HashMap();

    List colName = new ArrayList();
    for (int i = 0; i < columns.size(); i++) {
      String name = getColumnInternalName(i);
      ColumnInfo col = new ColumnInfo(name, columns.get(i)
          .getTypeInfo(), "", false);
      rowResolver.put(origInputAlias, name, col);
      colName.add(name);
      columnExprMap.put(name, columns.get(i));
    }

    Operator newInputOp = OperatorFactory.getAndMakeChild(
        new SelectDesc(columns, colName), new RowSchema(rowResolver.getColumnInfos()),
        columnExprMap, origInputOp);
    return putOpInsertMap(newInputOp, rowResolver);
  }

  /**
   * Generates the sampling predicate from the TABLESAMPLE clause information.
   * This function uses the bucket column list to decide the expression inputs
   * to the predicate hash function in case useBucketCols is set to true,
   * otherwise the expression list stored in the TableSample is used. The bucket
   * columns of the table are used to generate this predicate in case no
   * expressions are provided on the TABLESAMPLE clause and the table has
   * clustering columns defined in it's metadata. The predicate created has the
   * following structure:
   *
   * ((hash(expressions) & Integer.MAX_VALUE) % denominator) == numerator
   *
   * @param ts
   *          TABLESAMPLE clause information
   * @param bucketCols
   *          The clustering columns of the table
   * @param useBucketCols
   *          Flag to indicate whether the bucketCols should be used as input to
   *          the hash function
   * @param alias
   *          The alias used for the table in the row resolver
   * @param rwsch
   *          The row resolver used to resolve column references
   * @param qbm
   *          The metadata information for the query block which is used to
   *          resolve unaliased columns
   * @param planExpr
   *          The plan tree for the expression. If the user specified this, the
   *          parse expressions are not used
   * @return exprNodeDesc
   * @exception SemanticException
   */
  private ExprNodeDesc genSamplePredicate(TableSample ts,
      List bucketCols, boolean useBucketCols, String alias,
      RowResolver rwsch, QBMetaData qbm, ExprNodeDesc planExpr)
      throws SemanticException {

    ExprNodeDesc numeratorExpr = new ExprNodeConstantDesc(
        TypeInfoFactory.intTypeInfo, Integer.valueOf(ts.getNumerator() - 1));

    ExprNodeDesc denominatorExpr = new ExprNodeConstantDesc(
        TypeInfoFactory.intTypeInfo, Integer.valueOf(ts.getDenominator()));

    ExprNodeDesc intMaxExpr = new ExprNodeConstantDesc(
        TypeInfoFactory.intTypeInfo, Integer.valueOf(Integer.MAX_VALUE));

    ArrayList args = new ArrayList();
    if (planExpr != null) {
      args.add(planExpr);
    } else if (useBucketCols) {
      for (String col : bucketCols) {
        ColumnInfo ci = rwsch.get(alias, col);
        // TODO: change type to the one in the table schema
        args.add(new ExprNodeColumnDesc(ci));
      }
    } else {
      for (ASTNode expr : ts.getExprs()) {
        args.add(genExprNodeDesc(expr, rwsch));
      }
    }

    ExprNodeDesc equalsExpr = null;
    {
      ExprNodeDesc hashfnExpr = new ExprNodeGenericFuncDesc(
          TypeInfoFactory.intTypeInfo, new GenericUDFHash(), args);
      assert (hashfnExpr != null);
      LOG.info("hashfnExpr = " + hashfnExpr);
      ExprNodeDesc andExpr = TypeCheckProcFactory.DefaultExprProcessor
          .getFuncExprNodeDesc("&", hashfnExpr, intMaxExpr);
      assert (andExpr != null);
      LOG.info("andExpr = " + andExpr);
      ExprNodeDesc modExpr = TypeCheckProcFactory.DefaultExprProcessor
          .getFuncExprNodeDesc("%", andExpr, denominatorExpr);
      assert (modExpr != null);
      LOG.info("modExpr = " + modExpr);
      LOG.info("numeratorExpr = " + numeratorExpr);
      equalsExpr = TypeCheckProcFactory.DefaultExprProcessor
          .getFuncExprNodeDesc("==", modExpr, numeratorExpr);
      LOG.info("equalsExpr = " + equalsExpr);
      assert (equalsExpr != null);
    }
    return equalsExpr;
  }

  protected String getAliasId(String alias, QB qb) {
    return (qb.getId() == null ? alias : qb.getId() + ":" + alias).toLowerCase();
  }

  @SuppressWarnings("nls")
  private Operator genTablePlan(String alias, QB qb) throws SemanticException {

    String alias_id = getAliasId(alias, qb);
    Table tab = qb.getMetaData().getSrcForAlias(alias);
    RowResolver rwsch;

    // is the table already present
    TableScanOperator top = topOps.get(alias_id);

    // Obtain table props in query
    Map properties = qb.getTabPropsForAlias(alias);

    if (top == null) {
      // Determine row schema for TSOP.
      // Include column names from SerDe, the partition and virtual columns.
      rwsch = new RowResolver();
      try {
        // Including parameters passed in the query
        if (properties != null) {
          for (Entry prop : properties.entrySet()) {
            if (tab.getSerdeParam(prop.getKey()) != null) {
              LOG.warn("SerDe property in input query overrides stored SerDe property");
            }
            tab.setSerdeParam(prop.getKey(), prop.getValue());
          }
        }
        // Obtain inspector for schema
        StructObjectInspector rowObjectInspector = (StructObjectInspector) tab
            .getDeserializer().getObjectInspector();
        List fields = rowObjectInspector
            .getAllStructFieldRefs();
        for (int i = 0; i < fields.size(); i++) {
          /**
           * if the column is a skewed column, use ColumnInfo accordingly
           */
          ColumnInfo colInfo = new ColumnInfo(fields.get(i).getFieldName(),
              TypeInfoUtils.getTypeInfoFromObjectInspector(fields.get(i)
                  .getFieldObjectInspector()), alias, false);
          colInfo.setSkewedCol((isSkewedCol(alias, qb, fields.get(i)
              .getFieldName())) ? true : false);
          rwsch.put(alias, fields.get(i).getFieldName(), colInfo);
        }
      } catch (SerDeException e) {
        throw new RuntimeException(e);
      }
      // Hack!! - refactor once the metadata APIs with types are ready
      // Finally add the partitioning columns
      for (FieldSchema part_col : tab.getPartCols()) {
        LOG.trace("Adding partition col: " + part_col);
        rwsch.put(alias, part_col.getName(), new ColumnInfo(part_col.getName(),
            TypeInfoFactory.getPrimitiveTypeInfo(part_col.getType()), alias, true));
      }

      // put all virtual columns in RowResolver.
      Iterator vcs = VirtualColumn.getRegistry(conf).iterator();
      // use a list for easy cumtomize
      List vcList = new ArrayList();
      while (vcs.hasNext()) {
        VirtualColumn vc = vcs.next();
        rwsch.put(alias, vc.getName().toLowerCase(), new ColumnInfo(vc.getName(),
            vc.getTypeInfo(), alias, true, vc.getIsHidden()));
        vcList.add(vc);
      }

      // Create the root of the operator tree
      TableScanDesc tsDesc = new TableScanDesc(alias, vcList, tab);
      setupStats(tsDesc, qb.getParseInfo(), tab, alias, rwsch);

      SplitSample sample = nameToSplitSample.get(alias_id);
      if (sample != null && sample.getRowCount() != null) {
        tsDesc.setRowLimit(sample.getRowCount());
        nameToSplitSample.remove(alias_id);
      }

      top = (TableScanOperator) putOpInsertMap(OperatorFactory.get(getOpContext(), tsDesc,
          new RowSchema(rwsch.getColumnInfos())), rwsch);

      // Set insiderView so that we can skip the column authorization for this.
      top.setInsideView(qb.isInsideView() || qb.getAliasInsideView().contains(alias.toLowerCase()));

      // Add this to the list of top operators - we always start from a table
      // scan
      topOps.put(alias_id, top);

      // Add a mapping from the table scan operator to Table
      topToTable.put(top, tab);

      if (properties != null) {
        topToTableProps.put(top, properties);
        tsDesc.setOpProps(properties);
      }
    } else {
      rwsch = opParseCtx.get(top).getRowResolver();
      top.setChildOperators(null);
    }

    // check if this table is sampled and needs more than input pruning
    Operator op = top;
    TableSample ts = qb.getParseInfo().getTabSample(alias);
    if (ts != null) {
      TableScanOperator tableScanOp = top;
      tableScanOp.getConf().setTableSample(ts);
      int num = ts.getNumerator();
      int den = ts.getDenominator();
      ArrayList sampleExprs = ts.getExprs();

      // TODO: Do the type checking of the expressions
      List tabBucketCols = tab.getBucketCols();
      int numBuckets = tab.getNumBuckets();

      // If there are no sample cols and no bucket cols then throw an error
      if (tabBucketCols.size() == 0 && sampleExprs.size() == 0) {
        throw new SemanticException(ErrorMsg.NON_BUCKETED_TABLE.getMsg() + " "
            + tab.getTableName());
      }

      if (num > den) {
        throw new SemanticException(
            ErrorMsg.BUCKETED_NUMERATOR_BIGGER_DENOMINATOR.getMsg() + " "
                + tab.getTableName());
      }

      // check if a predicate is needed
      // predicate is needed if either input pruning is not enough
      // or if input pruning is not possible

      // check if the sample columns are the same as the table bucket columns
      boolean colsEqual = true;
      if ((sampleExprs.size() != tabBucketCols.size())
          && (sampleExprs.size() != 0)) {
        colsEqual = false;
      }

      for (int i = 0; i < sampleExprs.size() && colsEqual; i++) {
        boolean colFound = false;
        for (int j = 0; j < tabBucketCols.size() && !colFound; j++) {
          if (sampleExprs.get(i).getToken().getType() != HiveParser.TOK_TABLE_OR_COL) {
            break;
          }

          if (((ASTNode) sampleExprs.get(i).getChild(0)).getText()
              .equalsIgnoreCase(tabBucketCols.get(j))) {
            colFound = true;
          }
        }
        colsEqual = (colsEqual && colFound);
      }

      // Check if input can be pruned
      ts.setInputPruning((sampleExprs == null || sampleExprs.size() == 0 || colsEqual));

      // check if input pruning is enough
      if ((sampleExprs == null || sampleExprs.size() == 0 || colsEqual)
          && (num == den || (den % numBuckets == 0 || numBuckets % den == 0))) {

        // input pruning is enough; add the filter for the optimizer to use it
        // later
        LOG.info("No need for sample filter");
        ExprNodeDesc samplePredicate = genSamplePredicate(ts, tabBucketCols,
            colsEqual, alias, rwsch, qb.getMetaData(), null);
        FilterDesc filterDesc = new FilterDesc(
          samplePredicate, true, new SampleDesc(ts.getNumerator(),
            ts.getDenominator(), tabBucketCols, true));
        filterDesc.setGenerated(true);
        op = OperatorFactory.getAndMakeChild(filterDesc,
            new RowSchema(rwsch.getColumnInfos()), top);
      } else {
        // need to add filter
        // create tableOp to be filterDesc and set as child to 'top'
        LOG.info("Need sample filter");
        ExprNodeDesc samplePredicate = genSamplePredicate(ts, tabBucketCols,
            colsEqual, alias, rwsch, qb.getMetaData(), null);
        FilterDesc filterDesc = new FilterDesc(samplePredicate, true);
        filterDesc.setGenerated(true);
        op = OperatorFactory.getAndMakeChild(filterDesc,
            new RowSchema(rwsch.getColumnInfos()), top);
      }
    } else {
      boolean testMode = conf.getBoolVar(HiveConf.ConfVars.HIVETESTMODE);
      if (testMode) {
        String tabName = tab.getTableName();

        // has the user explicitly asked not to sample this table
        String unSampleTblList = conf
            .getVar(HiveConf.ConfVars.HIVETESTMODENOSAMPLE);
        String[] unSampleTbls = unSampleTblList.split(",");
        boolean unsample = false;
        for (String unSampleTbl : unSampleTbls) {
          if (tabName.equalsIgnoreCase(unSampleTbl)) {
            unsample = true;
          }
        }

        if (!unsample) {
          int numBuckets = tab.getNumBuckets();

          // If the input table is bucketed, choose the first bucket
          if (numBuckets > 0) {
            TableSample tsSample = new TableSample(1, numBuckets);
            tsSample.setInputPruning(true);
            qb.getParseInfo().setTabSample(alias, tsSample);
            ExprNodeDesc samplePred = genSamplePredicate(tsSample, tab
                .getBucketCols(), true, alias, rwsch, qb.getMetaData(), null);
            FilterDesc filterDesc = new FilterDesc(samplePred, true,
              new SampleDesc(tsSample.getNumerator(), tsSample
                .getDenominator(), tab.getBucketCols(), true));
            filterDesc.setGenerated(true);
            op = OperatorFactory.getAndMakeChild(filterDesc,
              new RowSchema(rwsch.getColumnInfos()), top);
            LOG.info("No need for sample filter");
          } else {
            // The table is not bucketed, add a dummy filter :: rand()
            int freq = conf.getIntVar(HiveConf.ConfVars.HIVETESTMODESAMPLEFREQ);
            TableSample tsSample = new TableSample(1, freq);
            tsSample.setInputPruning(false);
            qb.getParseInfo().setTabSample(alias, tsSample);
            LOG.info("Need sample filter");
            ExprNodeDesc randFunc = TypeCheckProcFactory.DefaultExprProcessor
                .getFuncExprNodeDesc("rand", new ExprNodeConstantDesc(Integer
                    .valueOf(460476415)));
            ExprNodeDesc samplePred = genSamplePredicate(tsSample, null, false,
                alias, rwsch, qb.getMetaData(), randFunc);
            FilterDesc filterDesc = new FilterDesc(samplePred, true);
            filterDesc.setGenerated(true);
            op = OperatorFactory.getAndMakeChild(filterDesc,
                new RowSchema(rwsch.getColumnInfos()), top);
          }
        }
      }
    }

    Operator output = putOpInsertMap(op, rwsch);

    if (LOG.isDebugEnabled()) {
      LOG.debug("Created Table Plan for " + alias + " " + op.toString());
    }

    return output;
  }

  static boolean isSkewedCol(String alias, QB qb, String colName) {
    boolean isSkewedCol = false;
    List skewedCols = qb.getSkewedColumnNames(alias);
    for (String skewedCol : skewedCols) {
      if (skewedCol.equalsIgnoreCase(colName)) {
        isSkewedCol = true;
      }
    }
    return isSkewedCol;
  }

  private void setupStats(TableScanDesc tsDesc, QBParseInfo qbp, Table tab, String alias,
      RowResolver rwsch)
      throws SemanticException {

    // if it is not analyze command and not column stats, then do not gatherstats
    // if it is column stats, but it is not tez, do not gatherstats
    if ((!qbp.isAnalyzeCommand() && qbp.getAnalyzeRewrite() == null)
        || (qbp.getAnalyzeRewrite() != null && !HiveConf.getVar(conf,
            HiveConf.ConfVars.HIVE_EXECUTION_ENGINE).equals("tez"))) {
      tsDesc.setGatherStats(false);
    } else {
      if (HiveConf.getVar(conf, HIVESTATSDBCLASS).equalsIgnoreCase(StatDB.fs.name())) {
        String statsTmpLoc = ctx.getTempDirForPath(tab.getPath()).toString();
        LOG.debug("Set stats collection dir : " + statsTmpLoc);
        tsDesc.setTmpStatsDir(statsTmpLoc);
      }
      tsDesc.setGatherStats(true);
      tsDesc.setStatsReliable(conf.getBoolVar(HiveConf.ConfVars.HIVE_STATS_RELIABLE));

      // append additional virtual columns for storing statistics
      Iterator vcs = VirtualColumn.getStatsRegistry(conf).iterator();
      List vcList = new ArrayList();
      while (vcs.hasNext()) {
        VirtualColumn vc = vcs.next();
        rwsch.put(alias, vc.getName(), new ColumnInfo(vc.getName(),
            vc.getTypeInfo(), alias, true, vc.getIsHidden()));
        vcList.add(vc);
      }
      tsDesc.addVirtualCols(vcList);

      String tblName = tab.getTableName();
      // Theoretically the key prefix could be any unique string shared
      // between TableScanOperator (when publishing) and StatsTask (when aggregating).
      // Here we use
      // db_name.table_name + partitionSec
      // as the prefix for easy of read during explain and debugging.
      // Currently, partition spec can only be static partition.
      String k = MetaStoreUtils.encodeTableName(tblName) + Path.SEPARATOR;
      tsDesc.setStatsAggPrefix(tab.getDbName()+"."+k);
      
      // set up WriteEntity for replication
      outputs.add(new WriteEntity(tab, WriteEntity.WriteType.DDL_SHARED));

      // add WriteEntity for each matching partition
      if (tab.isPartitioned()) {
        List cols = new ArrayList();
        if (qbp.getAnalyzeRewrite() != null) {
          List partitionCols = tab.getPartCols();
          for (FieldSchema fs : partitionCols) {
            cols.add(fs.getName());
          }
          tsDesc.setPartColumns(cols);
          return;
        }
        TableSpec tblSpec = qbp.getTableSpec(alias);
        Map partSpec = tblSpec.getPartSpec();
        if (partSpec != null) {
          cols.addAll(partSpec.keySet());
          tsDesc.setPartColumns(cols);
        } else {
          throw new SemanticException(ErrorMsg.NEED_PARTITION_SPECIFICATION.getMsg());
        }
        List partitions = qbp.getTableSpec().partitions;
        if (partitions != null) {
          for (Partition partn : partitions) {
            // inputs.add(new ReadEntity(partn)); // is this needed at all?
	      LOG.info("XXX: adding part: "+partn);
            outputs.add(new WriteEntity(partn, WriteEntity.WriteType.DDL_NO_LOCK));
          }
        }
      }
    }
  }

  private Operator genPlan(QB parent, QBExpr qbexpr) throws SemanticException {
    if (qbexpr.getOpcode() == QBExpr.Opcode.NULLOP) {
      boolean skipAmbiguityCheck = viewSelect == null && parent.isTopLevelSelectStarQuery();
      return genPlan(qbexpr.getQB(), skipAmbiguityCheck);
    }
    if (qbexpr.getOpcode() == QBExpr.Opcode.UNION) {
      Operator qbexpr1Ops = genPlan(parent, qbexpr.getQBExpr1());
      Operator qbexpr2Ops = genPlan(parent, qbexpr.getQBExpr2());

      return genUnionPlan(qbexpr.getAlias(), qbexpr.getQBExpr1().getAlias(),
          qbexpr1Ops, qbexpr.getQBExpr2().getAlias(), qbexpr2Ops);
    }
    return null;
  }

  public Operator genPlan(QB qb) throws SemanticException {
    return genPlan(qb, false);
  }

  @SuppressWarnings("nls")
  public Operator genPlan(QB qb, boolean skipAmbiguityCheck)
      throws SemanticException {

    // First generate all the opInfos for the elements in the from clause
    // Must be deterministic order map - see HIVE-8707
    Map aliasToOpInfo = new LinkedHashMap();

    // Recurse over the subqueries to fill the subquery part of the plan
    for (String alias : qb.getSubqAliases()) {
      QBExpr qbexpr = qb.getSubqForAlias(alias);
      Operator operator = genPlan(qb, qbexpr);
      aliasToOpInfo.put(alias, operator);
      if (qb.getViewToTabSchema().containsKey(alias)) {
        // we set viewProjectToTableSchema so that we can leverage ColumnPruner.
        if (operator instanceof SelectOperator) {
          if (this.viewProjectToTableSchema == null) {
            this.viewProjectToTableSchema = new LinkedHashMap<>();
          }
          viewProjectToTableSchema.put((SelectOperator) operator, qb.getViewToTabSchema()
              .get(alias));
        } else {
          throw new SemanticException("View " + alias + " is corresponding to "
              + operator.getType().name() + ", rather than a SelectOperator.");
        }
      }
    }

    // Recurse over all the source tables
    for (String alias : qb.getTabAliases()) {
      Operator op = genTablePlan(alias, qb);
      aliasToOpInfo.put(alias, op);
    }

    if (aliasToOpInfo.isEmpty()) {
      qb.getMetaData().setSrcForAlias(DUMMY_TABLE, getDummyTable());
      TableScanOperator op = (TableScanOperator) genTablePlan(DUMMY_TABLE, qb);
      op.getConf().setRowLimit(1);
      qb.addAlias(DUMMY_TABLE);
      qb.setTabAlias(DUMMY_TABLE, DUMMY_TABLE);
      aliasToOpInfo.put(DUMMY_TABLE, op);
    }

    Operator srcOpInfo = null;
    Operator lastPTFOp = null;

    if(queryProperties.hasPTF()){
      //After processing subqueries and source tables, process
      // partitioned table functions

      HashMap ptfNodeToSpec = qb.getPTFNodeToSpec();
      if ( ptfNodeToSpec != null ) {
        for(Entry entry : ptfNodeToSpec.entrySet()) {
          ASTNode ast = entry.getKey();
          PTFInvocationSpec spec = entry.getValue();
          String inputAlias = spec.getQueryInputName();
          Operator inOp = aliasToOpInfo.get(inputAlias);
          if ( inOp == null ) {
            throw new SemanticException(generateErrorMessage(ast,
                "Cannot resolve input Operator for PTF invocation"));
          }
          lastPTFOp = genPTFPlan(spec, inOp);
          String ptfAlias = spec.getFunction().getAlias();
          if ( ptfAlias != null ) {
            aliasToOpInfo.put(ptfAlias, lastPTFOp);
          }
        }
      }

    }

    // For all the source tables that have a lateral view, attach the
    // appropriate operators to the TS
    genLateralViewPlans(aliasToOpInfo, qb);


    // process join
    if (qb.getParseInfo().getJoinExpr() != null) {
      ASTNode joinExpr = qb.getParseInfo().getJoinExpr();

      if (joinExpr.getToken().getType() == HiveParser.TOK_UNIQUEJOIN) {
        QBJoinTree joinTree = genUniqueJoinTree(qb, joinExpr, aliasToOpInfo);
        qb.setQbJoinTree(joinTree);
      } else {
        QBJoinTree joinTree = genJoinTree(qb, joinExpr, aliasToOpInfo);
        qb.setQbJoinTree(joinTree);
        /*
         * if there is only one destination in Query try to push where predicates
         * as Join conditions
         */
        Set dests = qb.getParseInfo().getClauseNames();
        if ( dests.size() == 1 && joinTree.getNoOuterJoin()) {
          String dest = dests.iterator().next();
          ASTNode whereClause = qb.getParseInfo().getWhrForClause(dest);
          if ( whereClause != null ) {
            extractJoinCondsFromWhereClause(joinTree, qb, dest,
                (ASTNode) whereClause.getChild(0),
                aliasToOpInfo );
          }
        }

        if (!disableJoinMerge) {
          mergeJoinTree(qb);
        }
      }

      // if any filters are present in the join tree, push them on top of the
      // table
      pushJoinFilters(qb, qb.getQbJoinTree(), aliasToOpInfo);
      srcOpInfo = genJoinPlan(qb, aliasToOpInfo);
    } else {
      // Now if there are more than 1 sources then we have a join case
      // later we can extend this to the union all case as well
      srcOpInfo = aliasToOpInfo.values().iterator().next();
      // with ptfs, there maybe more (note for PTFChains:
      // 1 ptf invocation may entail multiple PTF operators)
      srcOpInfo = lastPTFOp != null ? lastPTFOp : srcOpInfo;
    }

    Operator bodyOpInfo = genBodyPlan(qb, srcOpInfo, aliasToOpInfo);

    if (LOG.isDebugEnabled()) {
      LOG.debug("Created Plan for Query Block " + qb.getId());
    }

    if (qb.getAlias() != null) {
      rewriteRRForSubQ(qb.getAlias(), bodyOpInfo, skipAmbiguityCheck);
    }

    setQB(qb);
    return bodyOpInfo;
  }

  // change curr ops row resolver's tab aliases to subq alias
  private void rewriteRRForSubQ(String alias, Operator operator, boolean skipAmbiguityCheck)
      throws SemanticException {
    RowResolver rr = opParseCtx.get(operator).getRowResolver();
    RowResolver newRR = new RowResolver();
    for (ColumnInfo colInfo : rr.getColumnInfos()) {
      String name = colInfo.getInternalName();
      String[] tmp = rr.reverseLookup(name);
      if ("".equals(tmp[0]) || tmp[1] == null) {
        // ast expression is not a valid column name for table
        tmp[1] = colInfo.getInternalName();
      } else if (newRR.get(alias, tmp[1]) != null) {
        // enforce uniqueness of column names
        if (!skipAmbiguityCheck) {
          throw new SemanticException(ErrorMsg.AMBIGUOUS_COLUMN.getMsg(tmp[1] + " in " + alias));
        }
        // if it's wrapped by top-level select star query, skip ambiguity check (for backward compatibility)
        tmp[1] = colInfo.getInternalName();
      }
      newRR.put(alias, tmp[1], colInfo);
    }
    opParseCtx.get(operator).setRowResolver(newRR);
  }

  private Table getDummyTable() throws SemanticException {
    Path dummyPath = createDummyFile();
    Table desc = new Table(DUMMY_DATABASE, DUMMY_TABLE);
    desc.getTTable().getSd().setLocation(dummyPath.toString());
    desc.getTTable().getSd().getSerdeInfo().setSerializationLib(NullStructSerDe.class.getName());
    desc.setInputFormatClass(NullRowsInputFormat.class);
    desc.setOutputFormatClass(HiveIgnoreKeyTextOutputFormat.class);
    return desc;
  }

  // add dummy data for not removed by CombineHiveInputFormat, etc.
  private Path createDummyFile() throws SemanticException {
    Path dummyPath = new Path(ctx.getMRScratchDir(), "dummy_path");
    Path dummyFile = new Path(dummyPath, "dummy_file");
    FSDataOutputStream fout = null;
    try {
      FileSystem fs = dummyFile.getFileSystem(conf);
      if (fs.exists(dummyFile)) {
        return dummyPath;
      }
      fout = fs.create(dummyFile);
      fout.write(1);
      fout.close();
    } catch (IOException e) {
      throw new SemanticException(e);
    } finally {
      IOUtils.closeStream(fout);
    }
    return dummyPath;
  }

  /**
   * Generates the operator DAG needed to implement lateral views and attaches
   * it to the TS operator.
   *
   * @param aliasToOpInfo
   *          A mapping from a table alias to the TS operator. This function
   *          replaces the operator mapping as necessary
   * @param qb
   * @throws SemanticException
   */

  void genLateralViewPlans(Map aliasToOpInfo, QB qb)
      throws SemanticException {
    Map> aliasToLateralViews = qb.getParseInfo()
        .getAliasToLateralViews();
    for (Entry e : aliasToOpInfo.entrySet()) {
      String alias = e.getKey();
      // See if the alias has a lateral view. If so, chain the lateral view
      // operator on
      ArrayList lateralViews = aliasToLateralViews.get(alias);
      if (lateralViews != null) {
        Operator op = e.getValue();

        for (ASTNode lateralViewTree : aliasToLateralViews.get(alias)) {
          // There are 2 paths from the TS operator (or a previous LVJ operator)
          // to the same LateralViewJoinOperator.
          // TS -> SelectOperator(*) -> LateralViewJoinOperator
          // TS -> SelectOperator (gets cols for UDTF) -> UDTFOperator0
          // -> LateralViewJoinOperator
          //

          Operator lateralViewJoin = genLateralViewPlan(qb, op, lateralViewTree);
          op = lateralViewJoin;
        }
        e.setValue(op);
      }
    }
  }

  private Operator genLateralViewPlanForDest(String dest, QB qb, Operator op)
      throws SemanticException {
    ASTNode lateralViewTree = qb.getParseInfo().getDestToLateralView().get(dest);
    if (lateralViewTree != null) {
      return genLateralViewPlan(qb, op, lateralViewTree);
    }
    return op;
  }

  private Operator genLateralViewPlan(QB qb, Operator op, ASTNode lateralViewTree)
      throws SemanticException {
    RowResolver lvForwardRR = new RowResolver();
    RowResolver source = opParseCtx.get(op).getRowResolver();
    Map lvfColExprMap = new HashMap();
    Map selColExprMap = new HashMap();
    List colList = new ArrayList();
    List colNames = new ArrayList();
    for (ColumnInfo col : source.getColumnInfos()) {
      String[] tabCol = source.reverseLookup(col.getInternalName());
      lvForwardRR.put(tabCol[0], tabCol[1], col);
      ExprNodeDesc colExpr = new ExprNodeColumnDesc(col);
      colList.add(colExpr);
      colNames.add(colExpr.getName());
      lvfColExprMap.put(col.getInternalName(), colExpr);
      selColExprMap.put(col.getInternalName(), colExpr.clone());
    }

    Operator lvForward = putOpInsertMap(OperatorFactory.getAndMakeChild(
        new LateralViewForwardDesc(), new RowSchema(lvForwardRR.getColumnInfos()),
        op), lvForwardRR);
    lvForward.setColumnExprMap(lvfColExprMap);

    // The order in which the two paths are added is important. The
    // lateral view join operator depends on having the select operator
    // give it the row first.

    // Get the all path by making a select(*).
    RowResolver allPathRR = opParseCtx.get(lvForward).getRowResolver();
    // Operator allPath = op;
    SelectDesc sDesc = new SelectDesc(colList, colNames, false);
    sDesc.setSelStarNoCompute(true);
    Operator allPath = putOpInsertMap(OperatorFactory.getAndMakeChild(
        sDesc, new RowSchema(allPathRR.getColumnInfos()),
        lvForward), allPathRR);
    allPath.setColumnExprMap(selColExprMap);
    int allColumns = allPathRR.getColumnInfos().size();
    // Get the UDTF Path
    QB blankQb = new QB(null, null, false);
    Operator udtfPath = genSelectPlan(null, (ASTNode) lateralViewTree
        .getChild(0), blankQb, lvForward, null,
        lateralViewTree.getType() == HiveParser.TOK_LATERAL_VIEW_OUTER);
    // add udtf aliases to QB
    for (String udtfAlias : blankQb.getAliases()) {
      qb.addAlias(udtfAlias);
    }
    RowResolver udtfPathRR = opParseCtx.get(udtfPath).getRowResolver();

    // Merge the two into the lateral view join
    // The cols of the merged result will be the combination of both the
    // cols of the UDTF path and the cols of the all path. The internal
    // names have to be changed to avoid conflicts

    RowResolver lateralViewRR = new RowResolver();
    ArrayList outputInternalColNames = new ArrayList();


    // For PPD, we need a column to expression map so that during the walk,
    // the processor knows how to transform the internal col names.
    // Following steps are dependant on the fact that we called
    // LVmerge.. in the above order
    Map colExprMap = new HashMap();

    LVmergeRowResolvers(allPathRR, lateralViewRR, colExprMap, outputInternalColNames);
    LVmergeRowResolvers(udtfPathRR, lateralViewRR, colExprMap, outputInternalColNames);

    Operator lateralViewJoin = putOpInsertMap(OperatorFactory
        .getAndMakeChild(new LateralViewJoinDesc(allColumns, outputInternalColNames),
            new RowSchema(lateralViewRR.getColumnInfos()), allPath,
            udtfPath), lateralViewRR);
    lateralViewJoin.setColumnExprMap(colExprMap);
    return lateralViewJoin;
  }

  /**
   * A helper function that gets all the columns and respective aliases in the
   * source and puts them into dest. It renames the internal names of the
   * columns based on getColumnInternalName(position).
   *
   * Note that this helper method relies on RowResolver.getColumnInfos()
   * returning the columns in the same order as they will be passed in the
   * operator DAG.
   *
   * @param source
   * @param dest
   * @param colExprMap
   * @param outputInternalColNames
   *          - a list to which the new internal column names will be added, in
   *          the same order as in the dest row resolver
   */
  private void LVmergeRowResolvers(RowResolver source, RowResolver dest,
      Map colExprMap, ArrayList outputInternalColNames) {
    for (ColumnInfo c : source.getColumnInfos()) {
      String internalName = getColumnInternalName(outputInternalColNames.size());
      outputInternalColNames.add(internalName);
      ColumnInfo newCol = new ColumnInfo(internalName, c.getType(), c
          .getTabAlias(), c.getIsVirtualCol(), c.isHiddenVirtualCol());
      String[] tableCol = source.reverseLookup(c.getInternalName());
      String tableAlias = tableCol[0];
      String colAlias = tableCol[1];
      dest.put(tableAlias, colAlias, newCol);
      colExprMap.put(internalName, new ExprNodeColumnDesc(c));
    }
  }

  @SuppressWarnings("nls")
  public Phase1Ctx initPhase1Ctx() {

    Phase1Ctx ctx_1 = new Phase1Ctx();
    ctx_1.nextNum = 0;
    ctx_1.dest = "reduce";

    return ctx_1;
  }

  @Override
  public void init(boolean clearPartsCache) {
    // clear most members
    reset(clearPartsCache);

    // init
    QB qb = new QB(null, null, false);
    this.qb = qb;
  }

  boolean analyzeCreateTable(ASTNode child) throws SemanticException {
    if (ast.getToken().getType() == HiveParser.TOK_CREATETABLE) {
      // if it is not CTAS, we don't need to go further and just return
      if ((child = analyzeCreateTable(ast, qb, null)) == null) {
        return true;
      }
    } else {
      queryState.setCommandType(HiveOperation.QUERY);
    }

    return false;
  }

  @Override
  @SuppressWarnings("nls")
  public void analyzeInternal(ASTNode ast) throws SemanticException {
    analyzeInternal(ast, new PlannerContext());
  }

  /**
   * Planner specific stuff goes in here.
   */
  static class PlannerContext {
    protected ASTNode   child;
    protected Phase1Ctx ctx_1;

    void setParseTreeAttr(ASTNode child, Phase1Ctx ctx_1) {
      this.child = child;
      this.ctx_1 = ctx_1;
    }

    void setCTASToken(ASTNode child) {
    }
    
    void setViewToken(ASTNode child) {
    }

    void setInsertToken(ASTNode ast, boolean isTmpFileDest) {
    }

    void setMultiInsertToken(ASTNode child) {
    }

    void resetToken() {
    }
  }

  private Table getTableObjectByName(String tableName) throws HiveException {
    if (!tabNameToTabObject.containsKey(tableName)) {
      Table table = db.getTable(tableName);
      tabNameToTabObject.put(tableName, table);
      return table;
    } else {
      return tabNameToTabObject.get(tableName);
    }
  }

  private static void walkASTMarkTABREF(TableMask tableMask, ASTNode ast, Set cteAlias,
      Context ctx, Hive db, Map tabNameToTabObject, Set ignoredTokens)
      throws SemanticException {
    Queue queue = new LinkedList<>();
    queue.add(ast);
    Map basicInfos = new LinkedHashMap<>();
    while (!queue.isEmpty()) {
      ASTNode astNode = (ASTNode) queue.poll();
      if (astNode.getToken().getType() == HiveParser.TOK_TABREF) {
        int aliasIndex = 0;
        StringBuffer additionalTabInfo = new StringBuffer();
        for (int index = 1; index < astNode.getChildCount(); index++) {
          ASTNode ct = (ASTNode) astNode.getChild(index);
          if (ct.getToken().getType() == HiveParser.TOK_TABLEBUCKETSAMPLE
              || ct.getToken().getType() == HiveParser.TOK_TABLESPLITSAMPLE
              || ct.getToken().getType() == HiveParser.TOK_TABLEPROPERTIES) {
            additionalTabInfo.append(ctx.getTokenRewriteStream().toString(ct.getTokenStartIndex(),
                ct.getTokenStopIndex()));
          } else {
            aliasIndex = index;
          }
        }

        ASTNode tableTree = (ASTNode) (astNode.getChild(0));

        String tabIdName = getUnescapedName(tableTree);

        String alias;
        if (aliasIndex != 0) {
          alias = unescapeIdentifier(astNode.getChild(aliasIndex).getText());
        } else {
          alias = getUnescapedUnqualifiedTableName(tableTree);
        }

        // We need to know if it is CTE or not.
        // A CTE may have the same name as a table.
        // For example,
        // with select TAB1 [masking] as TAB2
        // select * from TAB2 [no masking]
        if (cteAlias.contains(tabIdName)) {
          continue;
        }

        String replacementText = null;
        Table table = null;
        try {
          if (!tabNameToTabObject.containsKey(tabIdName)) {
            table = db.getTable(tabIdName, true);
            tabNameToTabObject.put(tabIdName, table);
          } else {
            table = tabNameToTabObject.get(tabIdName);
          }
        } catch (HiveException e) {
          // Table may not be found when materialization of CTE is on.
          STATIC_LOG.debug("Table " + tabIdName + " is not found in walkASTMarkTABREF.");
          continue;
        }

        List colNames = new ArrayList<>();
        List colTypes = new ArrayList<>();
        for (FieldSchema col : table.getAllCols()) {
          colNames.add(col.getName());
          colTypes.add(col.getType());
        }

        basicInfos.put(new HivePrivilegeObject(table.getDbName(), table.getTableName(), colNames),
            new MaskAndFilterInfo(colTypes, additionalTabInfo.toString(), alias, astNode, table.isView()));
      }
      if (astNode.getChildCount() > 0 && !ignoredTokens.contains(astNode.getToken().getType())) {
        for (Node child : astNode.getChildren()) {
          queue.offer(child);
        }
      }
    }
    List basicPrivObjs = new ArrayList<>();
    basicPrivObjs.addAll(basicInfos.keySet());
    List needRewritePrivObjs = tableMask
        .applyRowFilterAndColumnMasking(basicPrivObjs);
    if (needRewritePrivObjs != null && !needRewritePrivObjs.isEmpty()) {
      for (HivePrivilegeObject privObj : needRewritePrivObjs) {
        MaskAndFilterInfo info = basicInfos.get(privObj);
        String replacementText = tableMask.create(privObj, info);
        if (replacementText != null) {
          // We don't support masking/filtering against ACID query at the moment
          if (ctx.getIsUpdateDeleteMerge()) {
            throw new SemanticException(ErrorMsg.MASKING_FILTERING_ON_ACID_NOT_SUPPORTED,
                privObj.getDbname(), privObj.getObjectName());
          }
          tableMask.setNeedsRewrite(true);
          tableMask.addTranslation(info.astNode, replacementText);
        }
      }
    }
  }

  // We walk through the AST.
  // We replace all the TOK_TABREF by adding additional masking and filter if
  // the table needs to be masked or filtered.
  // For the replacement, we leverage the methods that are used for
  // unparseTranslator.
  protected static ASTNode rewriteASTWithMaskAndFilter(TableMask tableMask, ASTNode ast, TokenRewriteStream tokenRewriteStream,
          Context ctx, Hive db, Map tabNameToTabObject, Set ignoredTokens)
                  throws SemanticException {
    // 1. collect information about CTE if there is any.
    // The base table of CTE should be masked.
    // The CTE itself should not be masked in the references in the following main query.
    Set cteAlias = new HashSet<>();
    if (ast.getChildCount() > 0
        && HiveParser.TOK_CTE == ((ASTNode) ast.getChild(0)).getToken().getType()) {
      // the structure inside CTE is like this
      // TOK_CTE
      // TOK_SUBQUERY
      // sq1 (may refer to sq2)
      // ...
      // TOK_SUBQUERY
      // sq2
      ASTNode cte = (ASTNode) ast.getChild(0);
      // we start from sq2, end up with sq1.
      for (int index = cte.getChildCount() - 1; index >= 0; index--) {
        ASTNode subq = (ASTNode) cte.getChild(index);
        String alias = unescapeIdentifier(subq.getChild(1).getText());
        if (cteAlias.contains(alias)) {
          throw new SemanticException("Duplicate definition of " + alias);
        } else {
          cteAlias.add(alias);
          walkASTMarkTABREF(tableMask, subq, cteAlias,
                  ctx, db, tabNameToTabObject, ignoredTokens);
        }
      }
      // walk the other part of ast
      for (int index = 1; index < ast.getChildCount(); index++) {
        walkASTMarkTABREF(tableMask, (ASTNode) ast.getChild(index), cteAlias,
                ctx, db, tabNameToTabObject, ignoredTokens);
      }
    }
    // there is no CTE, walk the whole AST
    else {
      walkASTMarkTABREF(tableMask, ast, cteAlias,
              ctx, db, tabNameToTabObject, ignoredTokens);
    }
    // 2. rewrite the AST, replace TABREF with masking/filtering
    if (tableMask.needsRewrite()) {
      tableMask.applyTranslations(tokenRewriteStream);
      String rewrittenQuery = tokenRewriteStream.toString(
          ast.getTokenStartIndex(), ast.getTokenStopIndex());
      ASTNode rewrittenTree;
      // Parse the rewritten query string
      // check if we need to ctx.setCmd(rewrittenQuery);
      ParseDriver pd = new ParseDriver();
      try {
        rewrittenTree = ParseUtils.parse(rewrittenQuery);
      } catch (ParseException e) {
        throw new SemanticException(e);
      }
      return rewrittenTree;
    } else {
      return ast;
    }
  }

  boolean genResolvedParseTree(ASTNode ast, PlannerContext plannerCtx) throws SemanticException {
    ASTNode child = ast;
    this.ast = ast;
    viewsExpanded = new ArrayList();
    ctesExpanded = new ArrayList();

    // 1. analyze and process the position alias
    // step processPositionAlias out of genResolvedParseTree

    // 2. analyze create table command
    if (ast.getToken().getType() == HiveParser.TOK_CREATETABLE) {
      // if it is not CTAS, we don't need to go further and just return
      if ((child = analyzeCreateTable(ast, qb, plannerCtx)) == null) {
        return false;
      }
    } else {
      queryState.setCommandType(HiveOperation.QUERY);
    }

    // 3. analyze create view command
    if (ast.getToken().getType() == HiveParser.TOK_CREATEVIEW ||
        ast.getToken().getType() == HiveParser.TOK_CREATE_MATERIALIZED_VIEW ||
        (ast.getToken().getType() == HiveParser.TOK_ALTERVIEW &&
            ast.getChild(1).getType() == HiveParser.TOK_QUERY)) {
      child = analyzeCreateView(ast, qb, plannerCtx);
      if (child == null) {
        return false;
      }
      viewSelect = child;
      // prevent view from referencing itself
      viewsExpanded.add(createVwDesc.getViewName());
    }

    switch(ast.getToken().getType()) {
      case HiveParser.TOK_SET_AUTOCOMMIT:
        assert ast.getChildCount() == 1;
        if(ast.getChild(0).getType() == HiveParser.TOK_TRUE) {
          setAutoCommitValue(true);
        }
        else if(ast.getChild(0).getType() == HiveParser.TOK_FALSE) {
          setAutoCommitValue(false);
        }
        else {
          assert false : "Unexpected child of TOK_SET_AUTOCOMMIT: " + ast.getChild(0).getType();
        }
        //fall through
      case HiveParser.TOK_START_TRANSACTION:
      case HiveParser.TOK_COMMIT:
      case HiveParser.TOK_ROLLBACK:
        if(!(conf.getBoolVar(ConfVars.HIVE_IN_TEST) || conf.getBoolVar(ConfVars.HIVE_IN_TEZ_TEST))) {
          throw new IllegalStateException(SemanticAnalyzerFactory.getOperation(ast.getToken().getType()) +
            " is not supported yet.");
        }
        queryState.setCommandType(SemanticAnalyzerFactory.getOperation(ast.getToken().getType()));
        return false;
    }

    // masking and filtering should be created here
    // the basic idea is similar to unparseTranslator.
    tableMask = new TableMask(this, conf, ctx.isSkipTableMasking());

    // 4. continue analyzing from the child ASTNode.
    Phase1Ctx ctx_1 = initPhase1Ctx();
    preProcessForInsert(child, qb);
    if (!doPhase1(child, qb, ctx_1, plannerCtx)) {
      // if phase1Result false return
      return false;
    }
    LOG.info("Completed phase 1 of Semantic Analysis");

    // 5. Resolve Parse Tree
    // Materialization is allowed if it is not a view definition
    getMetaData(qb, createVwDesc == null);
    LOG.info("Completed getting MetaData in Semantic Analysis");

    plannerCtx.setParseTreeAttr(child, ctx_1);

    return true;
  }

  /**
   * This will walk AST of an INSERT statement and assemble a list of target tables
   * which are in an HDFS encryption zone.  This is needed to make sure that so that
   * the data from values clause of Insert ... select values(...) is stored securely.
   * See also {@link #genValuesTempTable(ASTNode, QB)}
   * @throws SemanticException
   */
  private void preProcessForInsert(ASTNode node, QB qb) throws SemanticException {
    try {
      if(!(node != null && node.getToken() != null && node.getToken().getType() == HiveParser.TOK_QUERY)) {
        return;
      }
      for (Node child : node.getChildren()) {
        //each insert of multi insert looks like
        //(TOK_INSERT (TOK_INSERT_INTO (TOK_TAB (TOK_TABNAME T1)))
        if (((ASTNode) child).getToken().getType() != HiveParser.TOK_INSERT) {
          continue;
        }
        ASTNode n = (ASTNode) ((ASTNode) child).getFirstChildWithType(HiveParser.TOK_INSERT_INTO);
        if (n == null) continue;
        n = (ASTNode) n.getFirstChildWithType(HiveParser.TOK_TAB);
        if (n == null) continue;
        n = (ASTNode) n.getFirstChildWithType(HiveParser.TOK_TABNAME);
        if (n == null) continue;
        String[] dbTab = getQualifiedTableName(n);
        Table t = db.getTable(dbTab[0], dbTab[1]);
        Path tablePath = t.getPath();
        if (isPathEncrypted(tablePath)) {
          qb.addEncryptedTargetTablePath(tablePath);
        }
      }
    }
    catch(Exception ex) {
      throw new SemanticException(ex);
    }
  }
  Operator genOPTree(ASTNode ast, PlannerContext plannerCtx) throws SemanticException {
    return genPlan(qb);
  }

  void analyzeInternal(ASTNode ast, PlannerContext plannerCtx) throws SemanticException {
    // 1. Generate Resolved Parse tree from syntax tree
    LOG.info("Starting Semantic Analysis");
    //change the location of position alias process here
    processPositionAlias(ast);
    if (!genResolvedParseTree(ast, plannerCtx)) {
      return;
    }

    // 2. Gen OP Tree from resolved Parse Tree
    Operator sinkOp = genOPTree(ast, plannerCtx);

    if (!unparseTranslator.isEnabled() && tableMask.isEnabled()) {
      // Here we rewrite the * and also the masking table
      ASTNode tree = rewriteASTWithMaskAndFilter(tableMask, ast, ctx.getTokenRewriteStream(),
              ctx, db, tabNameToTabObject, ignoredTokens);
      if (tree != ast) {
        ctx.setSkipTableMasking(true);
        init(true);
        //change the location of position alias process here
        processPositionAlias(tree);
        genResolvedParseTree(tree, plannerCtx);
        if (this instanceof CalcitePlanner) {
          ((CalcitePlanner) this).resetCalciteConfiguration();
        }
        sinkOp = genOPTree(tree, plannerCtx);
      }
    }

    // 3. Deduce Resultset Schema
    if (createVwDesc != null && !this.ctx.isCboSucceeded()) {
      resultSchema = convertRowSchemaToViewSchema(opParseCtx.get(sinkOp).getRowResolver());
    } else {
      // resultSchema will be null if
      // (1) cbo is disabled;
      // (2) or cbo is enabled with AST return path (whether succeeded or not,
      // resultSchema will be re-initialized)
      // It will only be not null if cbo is enabled with new return path and it
      // succeeds.
      if (resultSchema == null) {
        resultSchema = convertRowSchemaToResultSetSchema(opParseCtx.get(sinkOp).getRowResolver(),
            HiveConf.getBoolVar(conf, HiveConf.ConfVars.HIVE_RESULTSET_USE_UNIQUE_COLUMN_NAMES));
      }
    }

    // 4. Generate Parse Context for Optimizer & Physical compiler
    copyInfoToQueryProperties(queryProperties);
    ParseContext pCtx = new ParseContext(queryState, opToPartPruner, opToPartList, topOps,
        new HashSet(joinContext.keySet()),
        new HashSet(smbMapJoinContext.keySet()),
        loadTableWork, loadFileWork, columnStatsAutoGatherContexts, ctx, idToTableNameMap, destTableId, uCtx,
        listMapJoinOpsNoReducer, prunedPartitions, tabNameToTabObject, opToSamplePruner,
        globalLimitCtx, nameToSplitSample, inputs, rootTasks, opToPartToSkewedPruner,
        viewAliasToInput, reduceSinkOperatorsAddedByEnforceBucketingSorting,
        analyzeRewrite, tableDesc, createVwDesc, queryProperties, viewProjectToTableSchema, acidFileSinks);

    // 5. Take care of view creation
    if (createVwDesc != null) {
      if (ctx.getExplainAnalyze() == AnalyzeState.RUNNING) {
        return;
      }
      
      if (!ctx.isCboSucceeded()) {
        saveViewDefinition();
      }

      // validate the create view statement at this point, the createVwDesc gets
      // all the information for semanticcheck
      validateCreateView();

      if (!createVwDesc.isMaterialized()) {
        // Since we're only creating a view (not executing it), we don't need to
        // optimize or translate the plan (and in fact, those procedures can
        // interfere with the view creation). So skip the rest of this method.
        ctx.setResDir(null);
        ctx.setResFile(null);

        try {
          PlanUtils.addInputsForView(pCtx);
        } catch (HiveException e) {
          throw new SemanticException(e);
        }

        // Generate lineage info for create view statements
        // if LineageLogger hook is configured.
        // Add the transformation that computes the lineage information.
        Set postExecHooks = Sets.newHashSet(Splitter.on(",").trimResults()
            .omitEmptyStrings()
            .split(Strings.nullToEmpty(HiveConf.getVar(conf, HiveConf.ConfVars.POSTEXECHOOKS))));
        if (postExecHooks.contains("org.apache.hadoop.hive.ql.hooks.PostExecutePrinter")
            || postExecHooks.contains("org.apache.hadoop.hive.ql.hooks.LineageLogger")
            || postExecHooks.contains("org.apache.atlas.hive.hook.HiveHook")) {
          ArrayList transformations = new ArrayList();
          transformations.add(new HiveOpConverterPostProc());
          transformations.add(new Generator());
          for (Transform t : transformations) {
            pCtx = t.transform(pCtx);
          }
          // we just use view name as location.
          SessionState.get().getLineageState()
              .mapDirToOp(new Path(createVwDesc.getViewName()), sinkOp);
        }
        return;
      }
    }

    // 6. Generate table access stats if required
    if (HiveConf.getBoolVar(this.conf, HiveConf.ConfVars.HIVE_STATS_COLLECT_TABLEKEYS)) {
      TableAccessAnalyzer tableAccessAnalyzer = new TableAccessAnalyzer(pCtx);
      setTableAccessInfo(tableAccessAnalyzer.analyzeTableAccess());
    }

    // 7. Perform Logical optimization
    if (LOG.isDebugEnabled()) {
      LOG.debug("Before logical optimization\n" + Operator.toString(pCtx.getTopOps().values()));
    }
    Optimizer optm = new Optimizer();
    optm.setPctx(pCtx);
    optm.initialize(conf);
    pCtx = optm.optimize();
    if (pCtx.getColumnAccessInfo() != null) {
      // set ColumnAccessInfo for view column authorization
      setColumnAccessInfo(pCtx.getColumnAccessInfo());
    }
    FetchTask origFetchTask = pCtx.getFetchTask();
    if (LOG.isDebugEnabled()) {
      LOG.debug("After logical optimization\n" + Operator.toString(pCtx.getTopOps().values()));
    }

    // 8. Generate column access stats if required - wait until column pruning
    // takes place during optimization
    boolean isColumnInfoNeedForAuth = SessionState.get().isAuthorizationModeV2()
        && HiveConf.getBoolVar(conf, HiveConf.ConfVars.HIVE_AUTHORIZATION_ENABLED);
    if (isColumnInfoNeedForAuth
        || HiveConf.getBoolVar(this.conf, HiveConf.ConfVars.HIVE_STATS_COLLECT_SCANCOLS)) {
      ColumnAccessAnalyzer columnAccessAnalyzer = new ColumnAccessAnalyzer(pCtx);
      // view column access info is carried by this.getColumnAccessInfo().
      setColumnAccessInfo(columnAccessAnalyzer.analyzeColumnAccess(this.getColumnAccessInfo()));
    }

    // 9. Optimize Physical op tree & Translate to target execution engine (MR,
    // TEZ..)
    if (!ctx.getExplainLogical()) {
      TaskCompiler compiler = TaskCompilerFactory.getCompiler(conf, pCtx);
      compiler.init(queryState, console, db);
      compiler.compile(pCtx, rootTasks, inputs, outputs);
      fetchTask = pCtx.getFetchTask();
    }
    LOG.info("Completed plan generation");

    // 10. put accessed columns to readEntity
    if (HiveConf.getBoolVar(this.conf, HiveConf.ConfVars.HIVE_STATS_COLLECT_SCANCOLS)) {
      putAccessedColumnsToReadEntity(inputs, columnAccessInfo);
    }

    // 11. if desired check we're not going over partition scan limits
    if (!ctx.isExplainSkipExecution()) {
      enforceScanLimits(pCtx, origFetchTask);
    }

    return;
  }

  private void putAccessedColumnsToReadEntity(HashSet inputs, ColumnAccessInfo columnAccessInfo) {
    Map> tableToColumnAccessMap = columnAccessInfo.getTableToColumnAccessMap();
    if (tableToColumnAccessMap != null && !tableToColumnAccessMap.isEmpty()) {
      for(ReadEntity entity: inputs) {
        List cols;
        switch (entity.getType()) {
          case TABLE:
            cols = tableToColumnAccessMap.get(entity.getTable().getCompleteName());
            if (cols != null && !cols.isEmpty()) {
              entity.getAccessedColumns().addAll(cols);
            }
            break;
          case PARTITION:
            cols = tableToColumnAccessMap.get(entity.getPartition().getTable().getCompleteName());
            if (cols != null && !cols.isEmpty()) {
              entity.getAccessedColumns().addAll(cols);
            }
            break;
          default:
            // no-op
        }
      }
    }
  }

  private void enforceScanLimits(ParseContext pCtx, FetchTask fTask)
      throws SemanticException {
    int scanLimit = HiveConf.getIntVar(conf, HiveConf.ConfVars.HIVELIMITTABLESCANPARTITION);

    if (scanLimit > -1) {
      // a scan limit on the number of partitions has been set by the user
      if (fTask != null) {
        // having a fetch task at this point means that we're not going to
        // launch a job on the cluster
        if (!fTask.getWork().isNotPartitioned() && fTask.getWork().getLimit() == -1
            && scanLimit < fTask.getWork().getPartDir().size()) {
          throw new SemanticException(ErrorMsg.PARTITION_SCAN_LIMIT_EXCEEDED, ""
              + fTask.getWork().getPartDir().size(), ""
              + fTask.getWork().getTblDesc().getTableName(), "" + scanLimit);
        }
      } else {
        // At this point we've run the partition pruner for all top ops. Let's
        // check whether any of them break the limit
        for (Operator topOp : topOps.values()) {
          if (topOp instanceof TableScanOperator) {
            TableScanOperator tsOp = (TableScanOperator) topOp;
            if (tsOp.getConf().getIsMetadataOnly()) {
              continue;
            }
            PrunedPartitionList parts = pCtx.getPrunedPartitions(tsOp);
            if (!parts.getSourceTable().isPartitioned()) {
              continue;
            }
            if (parts.getPartitions().size() > scanLimit) {
              throw new SemanticException(ErrorMsg.PARTITION_SCAN_LIMIT_EXCEEDED, ""
                  + parts.getPartitions().size(), "" + parts.getSourceTable().getTableName(), ""
                  + scanLimit);
            }
          }
        }
      }
    }
  }

  @Override
  public List getResultSchema() {
    return resultSchema;
  }

  protected void saveViewDefinition() throws SemanticException {
    // Make a copy of the statement's result schema, since we may
    // modify it below as part of imposing view column names.
    List derivedSchema =
        new ArrayList(resultSchema);
    ParseUtils.validateColumnNameUniqueness(derivedSchema);

    List imposedSchema = createVwDesc.getSchema();
    if (imposedSchema != null) {
      int explicitColCount = imposedSchema.size();
      int derivedColCount = derivedSchema.size();
      if (explicitColCount != derivedColCount) {
        throw new SemanticException(generateErrorMessage(
            viewSelect,
            ErrorMsg.VIEW_COL_MISMATCH.getMsg()));
      }
    }

    // Preserve the original view definition as specified by the user.
    if (createVwDesc.getViewOriginalText() == null) {
      String originalText = ctx.getTokenRewriteStream().toString(
          viewSelect.getTokenStartIndex(), viewSelect.getTokenStopIndex());
      createVwDesc.setViewOriginalText(originalText);
    }

    // Now expand the view definition with extras such as explicit column
    // references; this expanded form is what we'll re-parse when the view is
    // referenced later.
    unparseTranslator.applyTranslations(ctx.getTokenRewriteStream());
    String expandedText = ctx.getTokenRewriteStream().toString(
        viewSelect.getTokenStartIndex(), viewSelect.getTokenStopIndex());

    if (imposedSchema != null) {
      // Merge the names from the imposed schema into the types
      // from the derived schema.
      StringBuilder sb = new StringBuilder();
      sb.append("SELECT ");
      int n = derivedSchema.size();
      for (int i = 0; i < n; ++i) {
        if (i > 0) {
          sb.append(", ");
        }
        FieldSchema fieldSchema = derivedSchema.get(i);
        // Modify a copy, not the original
        fieldSchema = new FieldSchema(fieldSchema);
        // TODO: there's a potential problem here if some table uses external schema like Avro,
        //       with a very large type name. It seems like the view does not derive the SerDe from
        //       the table, so it won't be able to just get the type from the deserializer like the
        //       table does; we won't be able to properly store the type in the RDBMS metastore.
        //       Not sure if these large cols could be in resultSchema. Ignore this for now 0_o
        derivedSchema.set(i, fieldSchema);
        sb.append(HiveUtils.unparseIdentifier(fieldSchema.getName(), conf));
        sb.append(" AS ");
        String imposedName = imposedSchema.get(i).getName();
        sb.append(HiveUtils.unparseIdentifier(imposedName, conf));
        fieldSchema.setName(imposedName);
        // We don't currently allow imposition of a type
        fieldSchema.setComment(imposedSchema.get(i).getComment());
      }
      sb.append(" FROM (");
      sb.append(expandedText);
      sb.append(") ");
      sb.append(HiveUtils.unparseIdentifier(createVwDesc.getViewName(), conf));
      expandedText = sb.toString();
    }

    if (createVwDesc.getPartColNames() != null) {
      // Make sure all partitioning columns referenced actually
      // exist and are in the correct order at the end
      // of the list of columns produced by the view. Also move the field
      // schema descriptors from derivedSchema to the partitioning key
      // descriptor.
      List partColNames = createVwDesc.getPartColNames();
      if (partColNames.size() > derivedSchema.size()) {
        throw new SemanticException(
            ErrorMsg.VIEW_PARTITION_MISMATCH.getMsg());
      }

      // Get the partition columns from the end of derivedSchema.
      List partitionColumns = derivedSchema.subList(
          derivedSchema.size() - partColNames.size(),
          derivedSchema.size());

      // Verify that the names match the PARTITIONED ON clause.
      Iterator colNameIter = partColNames.iterator();
      Iterator schemaIter = partitionColumns.iterator();
      while (colNameIter.hasNext()) {
        String colName = colNameIter.next();
        FieldSchema fieldSchema = schemaIter.next();
        if (!fieldSchema.getName().equals(colName)) {
          throw new SemanticException(
              ErrorMsg.VIEW_PARTITION_MISMATCH.getMsg());
        }
      }

      // Boundary case: require at least one non-partitioned column
      // for consistency with tables.
      if (partColNames.size() == derivedSchema.size()) {
        throw new SemanticException(
            ErrorMsg.VIEW_PARTITION_TOTAL.getMsg());
      }

      // Now make a copy.
      createVwDesc.setPartCols(
          new ArrayList(partitionColumns));

      // Finally, remove the partition columns from the end of derivedSchema.
      // (Clearing the subList writes through to the underlying
      // derivedSchema ArrayList.)
      partitionColumns.clear();
    }

    createVwDesc.setSchema(derivedSchema);
    if (!createVwDesc.isMaterialized()) {
      // materialized views don't store the expanded text as they won't be rewritten at query time.
      createVwDesc.setViewExpandedText(expandedText);
    }
  }

  static List convertRowSchemaToViewSchema(RowResolver rr) throws SemanticException {
    List fieldSchema = convertRowSchemaToResultSetSchema(rr, false);
    ParseUtils.validateColumnNameUniqueness(fieldSchema);
    return fieldSchema;
  }

  static List convertRowSchemaToResultSetSchema(RowResolver rr,
      boolean useTabAliasIfAvailable) {
    List fieldSchemas = new ArrayList();
    String[] qualifiedColName;
    String colName;

    for (ColumnInfo colInfo : rr.getColumnInfos()) {
      if (colInfo.isHiddenVirtualCol()) {
        continue;
      }

      qualifiedColName = rr.reverseLookup(colInfo.getInternalName());
      if (useTabAliasIfAvailable && qualifiedColName[0] != null && !qualifiedColName[0].isEmpty()) {
        colName = qualifiedColName[0] + "." + qualifiedColName[1];
      } else {
        colName = qualifiedColName[1];
      }
      fieldSchemas.add(new FieldSchema(colName, colInfo.getType().getTypeName(), null));
    }
    return fieldSchemas;
  }

  /**
   * Generates an expression node descriptor for the expression with TypeCheckCtx.
   */
  public ExprNodeDesc genExprNodeDesc(ASTNode expr, RowResolver input)
      throws SemanticException {
    // Since the user didn't supply a customized type-checking context,
    // use default settings.
    return genExprNodeDesc(expr, input, true, false);
  }

  public ExprNodeDesc genExprNodeDesc(ASTNode expr, RowResolver input,
                                      RowResolver outerRR, Map subqueryToRelNode,
                                      boolean useCaching) throws SemanticException {

    TypeCheckCtx tcCtx = new TypeCheckCtx(input, useCaching, false);
    tcCtx.setOuterRR(outerRR);
    tcCtx.setSubqueryToRelNode(subqueryToRelNode);
    return genExprNodeDesc(expr, input, tcCtx);
  }


  public ExprNodeDesc genExprNodeDesc(ASTNode expr, RowResolver input, boolean useCaching)
      throws SemanticException {
    return genExprNodeDesc(expr, input, useCaching, false);
  }

  public ExprNodeDesc genExprNodeDesc(ASTNode expr, RowResolver input, boolean useCaching,
      boolean foldExpr) throws SemanticException {
    TypeCheckCtx tcCtx = new TypeCheckCtx(input, useCaching, foldExpr);
    return genExprNodeDesc(expr, input, tcCtx);
  }

  /**
   * Generates an expression node descriptors for the expression and children of it
   * with default TypeCheckCtx.
   */
  public Map genAllExprNodeDesc(ASTNode expr, RowResolver input)
      throws SemanticException {
    TypeCheckCtx tcCtx = new TypeCheckCtx(input);
    return genAllExprNodeDesc(expr, input, tcCtx);
  }

  /**
   * Returns expression node descriptor for the expression.
   * If it's evaluated already in previous operator, it can be retrieved from cache.
   */
  public ExprNodeDesc genExprNodeDesc(ASTNode expr, RowResolver input,
      TypeCheckCtx tcCtx) throws SemanticException {
    // We recursively create the exprNodeDesc. Base cases: when we encounter
    // a column ref, we convert that into an exprNodeColumnDesc; when we
    // encounter
    // a constant, we convert that into an exprNodeConstantDesc. For others we
    // just
    // build the exprNodeFuncDesc with recursively built children.

    // If the current subExpression is pre-calculated, as in Group-By etc.
    ExprNodeDesc cached = null;
    if (tcCtx.isUseCaching()) {
      cached = getExprNodeDescCached(expr, input);
    }
    if (cached == null) {
      Map allExprs = genAllExprNodeDesc(expr, input, tcCtx);
      return allExprs.get(expr);
    }
    return cached;
  }

  /**
   * Find ExprNodeDesc for the expression cached in the RowResolver. Returns null if not exists.
   */
  private ExprNodeDesc getExprNodeDescCached(ASTNode expr, RowResolver input)
      throws SemanticException {
    ColumnInfo colInfo = input.getExpression(expr);
    if (colInfo != null) {
      ASTNode source = input.getExpressionSource(expr);
      if (source != null) {
        unparseTranslator.addCopyTranslation(expr, source);
      }
      return new ExprNodeColumnDesc(colInfo.getType(), colInfo
          .getInternalName(), colInfo.getTabAlias(), colInfo
          .getIsVirtualCol(), colInfo.isSkewedCol());
    }
    return null;
  }

  /**
   * Generates all of the expression node descriptors for the expression and children of it
   * passed in the arguments. This function uses the row resolver and the metadata information
   * that are passed as arguments to resolve the column names to internal names.
   *
   * @param expr
   *          The expression
   * @param input
   *          The row resolver
   * @param tcCtx
   *          Customized type-checking context
   * @return expression to exprNodeDesc mapping
   * @throws SemanticException Failed to evaluate expression
   */
  @SuppressWarnings("nls")
  public Map genAllExprNodeDesc(ASTNode expr, RowResolver input,
    TypeCheckCtx tcCtx) throws SemanticException {
    // Create the walker and  the rules dispatcher.
    tcCtx.setUnparseTranslator(unparseTranslator);

    Map nodeOutputs =
        TypeCheckProcFactory.genExprNode(expr, tcCtx);
    ExprNodeDesc desc = nodeOutputs.get(expr);
    if (desc == null) {
      String errMsg = tcCtx.getError();
      if (errMsg == null) {
        errMsg = "Error in parsing ";
      }
      throw new SemanticException(errMsg);
    }
    if (desc instanceof ExprNodeColumnListDesc) {
      throw new SemanticException("TOK_ALLCOLREF is not supported in current context");
    }

    if (!unparseTranslator.isEnabled()) {
      // Not creating a view, so no need to track view expansions.
      return nodeOutputs;
    }

    Map nodeToText = new HashMap<>();
    List fieldDescList = new ArrayList<>();

    for (Map.Entry entry : nodeOutputs.entrySet()) {
      if (!(entry.getValue() instanceof ExprNodeColumnDesc)) {
        // we need to translate the ExprNodeFieldDesc too, e.g., identifiers in
        // struct<>.
        if (entry.getValue() instanceof ExprNodeFieldDesc) {
          fieldDescList.add(entry.getKey());
        }
        continue;
      }
      ASTNode node = entry.getKey();
      ExprNodeColumnDesc columnDesc = (ExprNodeColumnDesc) entry.getValue();
      if ((columnDesc.getTabAlias() == null)
          || (columnDesc.getTabAlias().length() == 0)) {
        // These aren't real column refs; instead, they are special
        // internal expressions used in the representation of aggregation.
        continue;
      }
      String[] tmp = input.reverseLookup(columnDesc.getColumn());
      // in subquery case, tmp may be from outside.
      if (tmp[0] != null && columnDesc.getTabAlias() != null
          && !tmp[0].equals(columnDesc.getTabAlias()) && tcCtx.getOuterRR() != null) {
        tmp = tcCtx.getOuterRR().reverseLookup(columnDesc.getColumn());
      }
      StringBuilder replacementText = new StringBuilder();
      replacementText.append(HiveUtils.unparseIdentifier(tmp[0], conf));
      replacementText.append(".");
      replacementText.append(HiveUtils.unparseIdentifier(tmp[1], conf));
      nodeToText.put(columnDesc, replacementText.toString());
      unparseTranslator.addTranslation(node, replacementText.toString());
    }

    for (ASTNode node : fieldDescList) {
      Map map = translateFieldDesc(node);
      for (Entry entry : map.entrySet()) {
        unparseTranslator.addTranslation(entry.getKey(), entry.getValue());
      }
    }

    return nodeOutputs;
  }

  private Map translateFieldDesc(ASTNode node) {
    Map map = new HashMap<>();
    if (node.getType() == HiveParser.DOT) {
      for (Node child : node.getChildren()) {
        map.putAll(translateFieldDesc((ASTNode) child));
      }
    } else if (node.getType() == HiveParser.Identifier) {
      map.put(node, HiveUtils.unparseIdentifier(node.getText(), conf));
    }
    return map;
  }

  @Override
  public void validate() throws SemanticException {
    LOG.debug("validation start");
    // Validate inputs and outputs have right protectmode to execute the query
    for (ReadEntity readEntity : getInputs()) {
      ReadEntity.Type type = readEntity.getType();

      if (type != ReadEntity.Type.TABLE &&
          type != ReadEntity.Type.PARTITION) {
        // In current implementation it will never happen, but we leave it
        // here to make the logic complete.
        continue;
      }

      Table tbl = readEntity.getTable();
      Partition p = readEntity.getPartition();

      if (p != null) {
        tbl = p.getTable();
      }
      if (tbl != null && AcidUtils.isAcidTable(tbl)) {
        acidInQuery = true;
        checkAcidTxnManager(tbl);
      }
    }

    for (WriteEntity writeEntity : getOutputs()) {
      WriteEntity.Type type = writeEntity.getType();


      if (type == WriteEntity.Type.PARTITION || type == WriteEntity.Type.DUMMYPARTITION) {
        String conflictingArchive;
        try {
          Partition usedp = writeEntity.getPartition();
          Table tbl = usedp.getTable();

          LOG.debug("validated " + usedp.getName());
          LOG.debug(usedp.getTable().getTableName());
          conflictingArchive = ArchiveUtils
              .conflictingArchiveNameOrNull(db, tbl, usedp.getSpec());
        } catch (HiveException e) {
          throw new SemanticException(e);
        }
        if (conflictingArchive != null) {
          String message = String.format("Insert conflict with existing archive: %s",
              conflictingArchive);
          throw new SemanticException(message);
        }
      }

      if (type != WriteEntity.Type.TABLE &&
          type != WriteEntity.Type.PARTITION) {
        LOG.debug("not validating writeEntity, because entity is neither table nor partition");
        continue;
      }

      Table tbl;
      Partition p;


      if (type == WriteEntity.Type.PARTITION) {
        Partition inputPartition = writeEntity.getPartition();

        // If it is a partition, Partition's metastore is not fetched. We
        // need to fetch it.
        try {
          p = Hive.get().getPartition(
              inputPartition.getTable(), inputPartition.getSpec(), false);
          if (p != null) {
            tbl = p.getTable();
          } else {
            // if p is null, we assume that we insert to a new partition
            tbl = inputPartition.getTable();
          }
        } catch (HiveException e) {
          throw new SemanticException(e);
        }
      }
      else {
        LOG.debug("Not a partition.");
        tbl = writeEntity.getTable();
      }

      if (tbl != null && AcidUtils.isAcidTable(tbl)) {
        acidInQuery = true;
        checkAcidTxnManager(tbl);
      }
    }

    boolean reworkMapredWork = HiveConf.getBoolVar(this.conf,
        HiveConf.ConfVars.HIVE_REWORK_MAPREDWORK);

    // validate all tasks
    for (Task rootTask : rootTasks) {
      validate(rootTask, reworkMapredWork);
    }
  }

  private void validate(Task task, boolean reworkMapredWork)
      throws SemanticException {
    Utilities.reworkMapRedWork(task, reworkMapredWork, conf);
    if (task.getChildTasks() == null) {
      return;
    }

    for (Task childTask : task.getChildTasks()) {
      validate(childTask, reworkMapredWork);
    }
  }

  /**
   * Get the row resolver given an operator.
   */
  public RowResolver getRowResolver(Operator opt) {
    return opParseCtx.get(opt).getRowResolver();
  }

  /**
   * Add default properties for table property. If a default parameter exists
   * in the tblProp, the value in tblProp will be kept.
   *
   * @param tblProp
   *          property map
   * @return Modified table property map
   */
  private Map addDefaultProperties(Map tblProp) {
    Map retValue;
    if (tblProp == null) {
      retValue = new HashMap();
    } else {
      retValue = tblProp;
    }
    String paraString = HiveConf.getVar(conf, ConfVars.NEWTABLEDEFAULTPARA);
    if (paraString != null && !paraString.isEmpty()) {
      for (String keyValuePair : paraString.split(",")) {
        String[] keyValue = keyValuePair.split("=", 2);
        if (keyValue.length != 2) {
          continue;
        }
        if (!retValue.containsKey(keyValue[0])) {
          retValue.put(keyValue[0], keyValue[1]);
        }
      }
    }
    return retValue;
  }

  /**
   * Analyze the create table command. If it is a regular create-table or
   * create-table-like statements, we create a DDLWork and return true. If it is
   * a create-table-as-select, we get the necessary info such as the SerDe and
   * Storage Format and put it in QB, and return false, indicating the rest of
   * the semantic analyzer need to deal with the select statement with respect
   * to the SerDe and Storage Format.
   */
  ASTNode analyzeCreateTable(
      ASTNode ast, QB qb, PlannerContext plannerCtx) throws SemanticException {
    String[] qualifiedTabName = getQualifiedTableName((ASTNode) ast.getChild(0));
    String dbDotTab = getDotName(qualifiedTabName);

    String likeTableName = null;
    List cols = new ArrayList();
    List partCols = new ArrayList();
    List bucketCols = new ArrayList();
    List primaryKeys = new ArrayList();
    List foreignKeys = new ArrayList();
    List sortCols = new ArrayList();
    int numBuckets = -1;
    String comment = null;
    String location = null;
    Map tblProps = null;
    boolean ifNotExists = false;
    boolean isExt = false;
    boolean isTemporary = false;
    boolean isMaterialization = false;
    ASTNode selectStmt = null;
    final int CREATE_TABLE = 0; // regular CREATE TABLE
    final int CTLT = 1; // CREATE TABLE LIKE ... (CTLT)
    final int CTAS = 2; // CREATE TABLE AS SELECT ... (CTAS)
    int command_type = CREATE_TABLE;
    List skewedColNames = new ArrayList();
    List> skewedValues = new ArrayList>();
    Map, String> listBucketColValuesMapping = new HashMap, String>();
    boolean storedAsDirs = false;
    boolean isUserStorageFormat = false;

    RowFormatParams rowFormatParams = new RowFormatParams();
    StorageFormat storageFormat = new StorageFormat(conf);

    LOG.info("Creating table " + dbDotTab + " position=" + ast.getCharPositionInLine());
    int numCh = ast.getChildCount();

    /*
     * Check the 1st-level children and do simple semantic checks: 1) CTLT and
     * CTAS should not coexists. 2) CTLT or CTAS should not coexists with column
     * list (target table schema). 3) CTAS does not support partitioning (for
     * now).
     */
    for (int num = 1; num < numCh; num++) {
      ASTNode child = (ASTNode) ast.getChild(num);
      if (storageFormat.fillStorageFormat(child)) {
        isUserStorageFormat = true;
        continue;
      }
      switch (child.getToken().getType()) {
      case HiveParser.TOK_IFNOTEXISTS:
        ifNotExists = true;
        break;
      case HiveParser.KW_EXTERNAL:
        isExt = true;
        break;
      case HiveParser.KW_TEMPORARY:
        isTemporary = true;
        isMaterialization = MATERIALIZATION_MARKER.equals(child.getText());
        break;
      case HiveParser.TOK_LIKETABLE:
        if (child.getChildCount() > 0) {
          likeTableName = getUnescapedName((ASTNode) child.getChild(0));
          if (likeTableName != null) {
            if (command_type == CTAS) {
              throw new SemanticException(ErrorMsg.CTAS_CTLT_COEXISTENCE
                  .getMsg());
            }
            if (cols.size() != 0) {
              throw new SemanticException(ErrorMsg.CTLT_COLLST_COEXISTENCE
                  .getMsg());
            }
          }
          command_type = CTLT;
        }
        break;

      case HiveParser.TOK_QUERY: // CTAS
        if (command_type == CTLT) {
          throw new SemanticException(ErrorMsg.CTAS_CTLT_COEXISTENCE.getMsg());
        }
        if (cols.size() != 0) {
          throw new SemanticException(ErrorMsg.CTAS_COLLST_COEXISTENCE.getMsg());
        }
        if (partCols.size() != 0 || bucketCols.size() != 0) {
          boolean dynPart = HiveConf.getBoolVar(conf, HiveConf.ConfVars.DYNAMICPARTITIONING);
          if (dynPart == false) {
            throw new SemanticException(ErrorMsg.CTAS_PARCOL_COEXISTENCE.getMsg());
          } else {
            // TODO: support dynamic partition for CTAS
            throw new SemanticException(ErrorMsg.CTAS_PARCOL_COEXISTENCE.getMsg());
          }
        }
        if (isExt) {
          throw new SemanticException(ErrorMsg.CTAS_EXTTBL_COEXISTENCE.getMsg());
        }
        command_type = CTAS;
        if (plannerCtx != null) {
          plannerCtx.setCTASToken(child);
        }
        selectStmt = child;
        break;
      case HiveParser.TOK_TABCOLLIST:
        cols = getColumns(child, true, primaryKeys, foreignKeys);
        break;
      case HiveParser.TOK_TABLECOMMENT:
        comment = unescapeSQLString(child.getChild(0).getText());
        break;
      case HiveParser.TOK_TABLEPARTCOLS:
        partCols = getColumns((ASTNode) child.getChild(0), false);
        break;
      case HiveParser.TOK_ALTERTABLE_BUCKETS:
        bucketCols = getColumnNames((ASTNode) child.getChild(0));
        if (child.getChildCount() == 2) {
          numBuckets = Integer.parseInt(child.getChild(1).getText());
        } else {
          sortCols = getColumnNamesOrder((ASTNode) child.getChild(1));
          numBuckets = Integer.parseInt(child.getChild(2).getText());
        }
        break;
      case HiveParser.TOK_TABLEROWFORMAT:
        rowFormatParams.analyzeRowFormat(child);
        break;
      case HiveParser.TOK_TABLELOCATION:
        location = unescapeSQLString(child.getChild(0).getText());
        location = EximUtil.relativeToAbsolutePath(conf, location);
        inputs.add(toReadEntity(location));
        break;
      case HiveParser.TOK_TABLEPROPERTIES:
        tblProps = DDLSemanticAnalyzer.getProps((ASTNode) child.getChild(0));
        break;
      case HiveParser.TOK_TABLESERIALIZER:
        child = (ASTNode) child.getChild(0);
        storageFormat.setSerde(unescapeSQLString(child.getChild(0).getText()));
        if (child.getChildCount() == 2) {
          readProps((ASTNode) (child.getChild(1).getChild(0)),
              storageFormat.getSerdeProps());
        }
        break;
      case HiveParser.TOK_TABLESKEWED:
        /**
         * Throw an error if the user tries to use the DDL with
         * hive.internal.ddl.list.bucketing.enable set to false.
         */
        HiveConf hiveConf = SessionState.get().getConf();

        // skewed column names
        skewedColNames = analyzeSkewedTablDDLColNames(skewedColNames, child);
        // skewed value
        analyzeDDLSkewedValues(skewedValues, child);
        // stored as directories
        storedAsDirs = analyzeStoredAdDirs(child);

        break;
      default:
        throw new AssertionError("Unknown token: " + child.getToken());
      }
    }

    if (command_type == CREATE_TABLE || command_type == CTLT) {
        queryState.setCommandType(HiveOperation.CREATETABLE);
    } else if (command_type == CTAS) {
        queryState.setCommandType(HiveOperation.CREATETABLE_AS_SELECT);
    } else {
        throw new SemanticException("Unrecognized command.");
    }

    storageFormat.fillDefaultStorageFormat(isExt, false);

    // check for existence of table
    if (ifNotExists) {
      try {
        Table table = getTable(qualifiedTabName, false);
        if (table != null) { // table exists
          return null;
        }
      } catch (HiveException e) {
        // should not occur since second parameter to getTableWithQN is false
        throw new IllegalStateException("Unexpected Exception thrown: " + e.getMessage(), e);
      }
    }

    addDbAndTabToOutputs(qualifiedTabName, TableType.MANAGED_TABLE);

    if (isTemporary) {
      if (partCols.size() > 0) {
        throw new SemanticException("Partition columns are not supported on temporary tables");
      }

      if (location == null) {
        // for temporary tables we set the location to something in the session's scratch dir
        // it has the same life cycle as the tmp table
        try {
          // Generate a unique ID for temp table path.
          // This path will be fixed for the life of the temp table.
          Path path = new Path(SessionState.getTempTableSpace(conf), UUID.randomUUID().toString());
          path = Warehouse.getDnsPath(path, conf);
          location = path.toString();
        } catch (MetaException err) {
          throw new SemanticException("Error while generating temp table path:", err);
        }
      }
    }

    // Handle different types of CREATE TABLE command
    switch (command_type) {

    case CREATE_TABLE: // REGULAR CREATE TABLE DDL
      tblProps = addDefaultProperties(tblProps);

      CreateTableDesc crtTblDesc = new CreateTableDesc(dbDotTab, isExt, isTemporary, cols, partCols,
          bucketCols, sortCols, numBuckets, rowFormatParams.fieldDelim,
          rowFormatParams.fieldEscape,
          rowFormatParams.collItemDelim, rowFormatParams.mapKeyDelim, rowFormatParams.lineDelim,
          comment,
          storageFormat.getInputFormat(), storageFormat.getOutputFormat(), location, storageFormat.getSerde(),
          storageFormat.getStorageHandler(), storageFormat.getSerdeProps(), tblProps, ifNotExists, skewedColNames,
          skewedValues, primaryKeys, foreignKeys);
      crtTblDesc.setStoredAsSubDirectories(storedAsDirs);
      crtTblDesc.setNullFormat(rowFormatParams.nullFormat);

      crtTblDesc.validate(conf);
      // outputs is empty, which means this create table happens in the current
      // database.
      rootTasks.add(TaskFactory.get(new DDLWork(getInputs(), getOutputs(),
          crtTblDesc), conf));
      break;

    case CTLT: // create table like 
      tblProps = addDefaultProperties(tblProps);

      if (isTemporary) {
        Table likeTable = getTable(likeTableName, false);
        if (likeTable != null && likeTable.getPartCols().size() > 0) {
          throw new SemanticException("Partition columns are not supported on temporary tables "
              + "and source table in CREATE TABLE LIKE is partitioned.");
        }
      }
      CreateTableLikeDesc crtTblLikeDesc = new CreateTableLikeDesc(dbDotTab, isExt, isTemporary,
          storageFormat.getInputFormat(), storageFormat.getOutputFormat(), location,
          storageFormat.getSerde(), storageFormat.getSerdeProps(), tblProps, ifNotExists,
          likeTableName, isUserStorageFormat);
      rootTasks.add(TaskFactory.get(new DDLWork(getInputs(), getOutputs(),
          crtTblLikeDesc), conf));
      break;

    case CTAS: // create table as select

      if (isTemporary) {
        if (!ctx.isExplainSkipExecution() && !isMaterialization) {
          String dbName = qualifiedTabName[0];
          String tblName = qualifiedTabName[1];
          SessionState ss = SessionState.get();
          if (ss == null) {
            throw new SemanticException("No current SessionState, cannot create temporary table "
                + dbName + "." + tblName);
          }
          Map tables = SessionHiveMetaStoreClient.getTempTablesForDatabase(dbName);
          if (tables != null && tables.containsKey(tblName)) {
            throw new SemanticException("Temporary table " + dbName + "." + tblName
                + " already exists");
          }
        }
      } else {
        // Verify that the table does not already exist
        // dumpTable is only used to check the conflict for non-temporary tables
        try {
          Table dumpTable = db.newTable(dbDotTab);
          if (null != db.getTable(dumpTable.getDbName(), dumpTable.getTableName(), false) && !ctx.isExplainSkipExecution()) {
            throw new SemanticException(ErrorMsg.TABLE_ALREADY_EXISTS.getMsg(dbDotTab));
          }
        } catch (HiveException e) {
          throw new SemanticException(e);
        }
      }

      if(location != null && location.length() != 0) {
        Path locPath = new Path(location);
        FileSystem curFs = null;
        FileStatus locStats = null;
        try {
          curFs = locPath.getFileSystem(conf);
          if(curFs != null) {
            locStats = curFs.getFileStatus(locPath);
          }
          if(locStats != null && locStats.isDir()) {
            FileStatus[] lStats = curFs.listStatus(locPath);
            if(lStats != null && lStats.length != 0) {
              // Don't throw an exception if the target location only contains the staging-dirs
              for (FileStatus lStat : lStats) {
                if (!lStat.getPath().getName().startsWith(HiveConf.getVar(conf, HiveConf.ConfVars.STAGINGDIR))) {
                  throw new SemanticException(ErrorMsg.CTAS_LOCATION_NONEMPTY.getMsg(location));
                }
              }
            }
          }
        } catch (FileNotFoundException nfe) {
          //we will create the folder if it does not exist.
        } catch (IOException ioE) {
          if (LOG.isDebugEnabled()) {
            LOG.debug("Exception when validate folder ",ioE);
          }

        }
      }

      tblProps = addDefaultProperties(tblProps);

      tableDesc = new CreateTableDesc(qualifiedTabName[0], dbDotTab, isExt, isTemporary, cols,
          partCols, bucketCols, sortCols, numBuckets, rowFormatParams.fieldDelim,
          rowFormatParams.fieldEscape, rowFormatParams.collItemDelim, rowFormatParams.mapKeyDelim,
          rowFormatParams.lineDelim, comment, storageFormat.getInputFormat(),
          storageFormat.getOutputFormat(), location, storageFormat.getSerde(),
          storageFormat.getStorageHandler(), storageFormat.getSerdeProps(), tblProps, ifNotExists,
	  skewedColNames, skewedValues, true, primaryKeys, foreignKeys);
      tableDesc.setMaterialization(isMaterialization);
      tableDesc.setStoredAsSubDirectories(storedAsDirs);
      tableDesc.setNullFormat(rowFormatParams.nullFormat);
      qb.setTableDesc(tableDesc);

      return selectStmt;

    default:
      throw new SemanticException("Unrecognized command.");
    }
    return null;
  }

  private void addDbAndTabToOutputs(String[] qualifiedTabName, TableType type) throws SemanticException {
    Database database  = getDatabase(qualifiedTabName[0]);
    outputs.add(new WriteEntity(database, WriteEntity.WriteType.DDL_SHARED));

    Table t = new Table(qualifiedTabName[0], qualifiedTabName[1]);
    t.setTableType(type);
    outputs.add(new WriteEntity(t, WriteEntity.WriteType.DDL_NO_LOCK));
  }

  protected ASTNode analyzeCreateView(ASTNode ast, QB qb, PlannerContext plannerCtx) throws SemanticException {
    String[] qualTabName = getQualifiedTableName((ASTNode) ast.getChild(0));
    String dbDotTable = getDotName(qualTabName);
    List cols = null;
    boolean ifNotExists = false;
    boolean rewriteEnabled = false;
    boolean orReplace = false;
    boolean isAlterViewAs = false;
    String comment = null;
    ASTNode selectStmt = null;
    Map tblProps = null;
    List partColNames = null;
    boolean isMaterialized = ast.getToken().getType() == HiveParser.TOK_CREATE_MATERIALIZED_VIEW;
    String location = null;
    RowFormatParams rowFormatParams = new RowFormatParams();
    StorageFormat storageFormat = new StorageFormat(conf);

    LOG.info("Creating view " + dbDotTable + " position="
        + ast.getCharPositionInLine());
    int numCh = ast.getChildCount();
    for (int num = 1; num < numCh; num++) {
      ASTNode child = (ASTNode) ast.getChild(num);
      if (storageFormat.fillStorageFormat(child)) {
        continue;
      }
      switch (child.getToken().getType()) {
      case HiveParser.TOK_IFNOTEXISTS:
        ifNotExists = true;
        break;
      case HiveParser.TOK_REWRITE_ENABLED:
        rewriteEnabled = true;
        break;
      case HiveParser.TOK_ORREPLACE:
        orReplace = true;
        break;
      case HiveParser.TOK_QUERY:
        // For CBO
        if (plannerCtx != null) {
          plannerCtx.setViewToken(child);
        }
        selectStmt = child;
        break;
      case HiveParser.TOK_TABCOLNAME:
        cols = getColumns(child);
        break;
      case HiveParser.TOK_TABLECOMMENT:
        comment = unescapeSQLString(child.getChild(0).getText());
        break;
      case HiveParser.TOK_TABLEPROPERTIES:
        tblProps = DDLSemanticAnalyzer.getProps((ASTNode) child.getChild(0));
        break;
      case HiveParser.TOK_VIEWPARTCOLS:
        partColNames = getColumnNames((ASTNode) child.getChild(0));
        break;
      case HiveParser.TOK_TABLEROWFORMAT:
        rowFormatParams.analyzeRowFormat(child);
        break;
      case HiveParser.TOK_TABLELOCATION:
        location = unescapeSQLString(child.getChild(0).getText());
        location = EximUtil.relativeToAbsolutePath(conf, location);
        inputs.add(toReadEntity(location));
        break;
      case HiveParser.TOK_TABLESERIALIZER:
        child = (ASTNode) child.getChild(0);
        storageFormat.setSerde(unescapeSQLString(child.getChild(0).getText()));
        if (child.getChildCount() == 2) {
          readProps((ASTNode) (child.getChild(1).getChild(0)),
              storageFormat.getSerdeProps());
        }
        break;
      default:
        assert false;
      }
    }

    storageFormat.fillDefaultStorageFormat(false, isMaterialized);

    if (ifNotExists && orReplace){
      throw new SemanticException("Can't combine IF NOT EXISTS and OR REPLACE.");
    }

    if (ast.getToken().getType() == HiveParser.TOK_ALTERVIEW &&
        ast.getChild(1).getType() == HiveParser.TOK_QUERY) {
      isAlterViewAs = true;
      orReplace = true;
    }

    unparseTranslator.enable();

    if (isMaterialized) {
      createVwDesc = new CreateViewDesc(
          dbDotTable, cols, comment, tblProps, partColNames,
          ifNotExists, orReplace, rewriteEnabled, isAlterViewAs,
          storageFormat.getInputFormat(), storageFormat.getOutputFormat(),
          location, storageFormat.getSerde(), storageFormat.getStorageHandler(),
          storageFormat.getSerdeProps());
      addDbAndTabToOutputs(qualTabName, TableType.MATERIALIZED_VIEW);
      queryState.setCommandType(HiveOperation.CREATE_MATERIALIZED_VIEW);
    } else {
      createVwDesc = new CreateViewDesc(
          dbDotTable, cols, comment, tblProps, partColNames,
          ifNotExists, orReplace, isAlterViewAs, storageFormat.getInputFormat(),
          storageFormat.getOutputFormat(), storageFormat.getSerde());
      rootTasks.add(TaskFactory.get(new DDLWork(getInputs(), getOutputs(),
          createVwDesc), conf));
      addDbAndTabToOutputs(qualTabName, TableType.VIRTUAL_VIEW);
      queryState.setCommandType(HiveOperation.CREATEVIEW);
    }
    qb.setViewDesc(createVwDesc);

    return selectStmt;
  }

  CreateViewDesc getCreateViewDesc() {
    return this.createVwDesc;
  }

  // validate the (materialized) view statement
  // check semantic conditions
  private void validateCreateView()
    throws SemanticException {
    try {
      Table oldView = getTable(createVwDesc.getViewName(), false);

      // Do not allow view to be defined on temp table
      Set tableAliases = qb.getTabAliases();
      for (String alias : tableAliases) {
        try {
          Table table = this.getTableObjectByName(qb.getTabNameForAlias(alias));
          if (table.isTemporary()) {
            throw new SemanticException("View definition references temporary table " + alias);
          }
        } catch (HiveException ex) {
          throw new SemanticException(ex);
        }
      }

      // ALTER VIEW AS SELECT requires the view must exist
      if (createVwDesc.getIsAlterViewAs() && oldView == null) {
        String viewNotExistErrorMsg =
          "The following view does not exist: " + createVwDesc.getViewName();
        throw new SemanticException(
          ErrorMsg.ALTER_VIEW_AS_SELECT_NOT_EXIST.getMsg(viewNotExistErrorMsg));
      }

      //replace view
      if (createVwDesc.getOrReplace() && oldView != null) {

        // Don't allow swapping between virtual and materialized view in replace
        if (oldView.getTableType().equals(TableType.VIRTUAL_VIEW) && createVwDesc.isMaterialized()) {
          throw new SemanticException(ErrorMsg.REPLACE_VIEW_WITH_MATERIALIZED,
              oldView.getTableName());
        }

        if (oldView.getTableType().equals(TableType.MATERIALIZED_VIEW) &&
            !createVwDesc.isMaterialized()) {
          throw new SemanticException(ErrorMsg.REPLACE_MATERIALIZED_WITH_VIEW,
              oldView.getTableName());
        }

        // Existing table is not a view
        if (!oldView.getTableType().equals(TableType.VIRTUAL_VIEW) &&
            !oldView.getTableType().equals(TableType.MATERIALIZED_VIEW)) {
          String tableNotViewErrorMsg =
            "The following is an existing table, not a view: " +
            createVwDesc.getViewName();
          throw new SemanticException(
            ErrorMsg.EXISTING_TABLE_IS_NOT_VIEW.getMsg(tableNotViewErrorMsg));
        }

        if (!createVwDesc.isMaterialized()) {
          // if old view has partitions, it could not be replaced
          String partitionViewErrorMsg =
              "The following view has partition, it could not be replaced: " +
                  createVwDesc.getViewName();
          try {
            if ((createVwDesc.getPartCols() == null ||
                createVwDesc.getPartCols().isEmpty() ||
                !createVwDesc.getPartCols().equals(oldView.getPartCols())) &&
                !oldView.getPartCols().isEmpty() &&
                !db.getPartitions(oldView).isEmpty()) {
              throw new SemanticException(
                  ErrorMsg.REPLACE_VIEW_WITH_PARTITION.getMsg(partitionViewErrorMsg));
            }
          } catch (HiveException e) {
            throw new SemanticException(
                ErrorMsg.REPLACE_VIEW_WITH_PARTITION.getMsg(partitionViewErrorMsg));
          }
        }
      }
    } catch (HiveException e) {
      throw new SemanticException(e.getMessage(), e);
    }
  }

  // Process the position alias in GROUPBY and ORDERBY
  public void processPositionAlias(ASTNode ast) throws SemanticException {
    boolean isBothByPos = HiveConf.getBoolVar(conf, ConfVars.HIVE_GROUPBY_ORDERBY_POSITION_ALIAS);
    boolean isGbyByPos = isBothByPos
        || HiveConf.getBoolVar(conf, ConfVars.HIVE_GROUPBY_POSITION_ALIAS);
    boolean isObyByPos = isBothByPos
        || HiveConf.getBoolVar(conf, ConfVars.HIVE_ORDERBY_POSITION_ALIAS);

    Deque stack = new ArrayDeque();
    stack.push(ast);

    while (!stack.isEmpty()) {
      ASTNode next = stack.pop();

      if (next.getChildCount()  == 0) {
        continue;
      }

      boolean isAllCol;
      ASTNode selectNode = null;
      ASTNode groupbyNode = null;
      ASTNode orderbyNode = null;

      // get node type
      int child_count = next.getChildCount();
      for (int child_pos = 0; child_pos < child_count; ++child_pos) {
        ASTNode node = (ASTNode) next.getChild(child_pos);
        int type = node.getToken().getType();
        if (type == HiveParser.TOK_SELECT) {
          selectNode = node;
        } else if (type == HiveParser.TOK_GROUPBY) {
          groupbyNode = node;
        } else if (type == HiveParser.TOK_ORDERBY) {
          orderbyNode = node;
        }
      }

      if (selectNode != null) {
        int selectExpCnt = selectNode.getChildCount();

        // replace each of the position alias in GROUPBY with the actual column name
        if (groupbyNode != null) {
          for (int child_pos = 0; child_pos < groupbyNode.getChildCount(); ++child_pos) {
            ASTNode node = (ASTNode) groupbyNode.getChild(child_pos);
            if (node.getToken().getType() == HiveParser.Number) {
              if (isGbyByPos) {
                int pos = Integer.parseInt(node.getText());
                if (pos > 0 && pos <= selectExpCnt) {
                  groupbyNode.setChild(child_pos,
                    selectNode.getChild(pos - 1).getChild(0));
                } else {
                  throw new SemanticException(
                    ErrorMsg.INVALID_POSITION_ALIAS_IN_GROUPBY.getMsg(
                    "Position alias: " + pos + " does not exist\n" +
                    "The Select List is indexed from 1 to " + selectExpCnt));
                }
              } else {
                warn("Using constant number  " + node.getText() +
                  " in group by. If you try to use position alias when hive.groupby.position.alias is false, the position alias will be ignored.");
              }
            }
          }
        }

        // replace each of the position alias in ORDERBY with the actual column name
        if (orderbyNode != null) {
          isAllCol = false;
          for (int child_pos = 0; child_pos < selectNode.getChildCount(); ++child_pos) {
            ASTNode node = (ASTNode) selectNode.getChild(child_pos).getChild(0);
            if (node != null && node.getToken().getType() == HiveParser.TOK_ALLCOLREF) {
              isAllCol = true;
            }
          }
          for (int child_pos = 0; child_pos < orderbyNode.getChildCount(); ++child_pos) {
            ASTNode colNode = (ASTNode) orderbyNode.getChild(child_pos).getChild(0);
            ASTNode node = (ASTNode) colNode.getChild(0);
            if (node != null && node.getToken().getType() == HiveParser.Number) {
              if (isObyByPos) {
                if (!isAllCol) {
                  int pos = Integer.parseInt(node.getText());
                  if (pos > 0 && pos <= selectExpCnt) {
                    colNode.setChild(0, selectNode.getChild(pos - 1).getChild(0));
                  } else {
                    throw new SemanticException(
                      ErrorMsg.INVALID_POSITION_ALIAS_IN_ORDERBY.getMsg(
                      "Position alias: " + pos + " does not exist\n" +
                      "The Select List is indexed from 1 to " + selectExpCnt));
                  }
                } else {
                  throw new SemanticException(
                    ErrorMsg.NO_SUPPORTED_ORDERBY_ALLCOLREF_POS.getMsg());
                }
              } else { //if not using position alias and it is a number.
                warn("Using constant number " + node.getText() +
                  " in order by. If you try to use position alias when hive.orderby.position.alias is false, the position alias will be ignored.");
              }
            }
          }
        }
      }

      for (int i = next.getChildren().size() - 1; i >= 0; i--) {
        stack.push((ASTNode)next.getChildren().get(i));
      }
    }
  }

  /**
   * process analyze ... partial command
   *
   * separate it from noscan command process so that it provides us flexibility
   *
   * @param tree
   * @throws SemanticException
   */
  protected void processPartialScanCommand (ASTNode tree) throws SemanticException {
    // check if it is partial scan command
    this.checkPartialScan(tree);

    //validate partial scan
    if (this.partialscan) {
      validateAnalyzePartialscan(tree);
    }
  }

  /**
   * process analyze ... noscan command
   * @param tree
   * @throws SemanticException
   */
  protected void processNoScanCommand (ASTNode tree) throws SemanticException {
    // check if it is noscan command
    checkNoScan(tree);

    //validate noscan
    if (this.noscan) {
      validateAnalyzeNoscan(tree);
    }
  }

  /**
   * Validate noscan command
   *
   * @param tree
   * @throws SemanticException
   */
  private void validateAnalyzeNoscan(ASTNode tree) throws SemanticException {
    // since it is noscan, it is true table name in command
    String tableName = getUnescapedName((ASTNode) tree.getChild(0).getChild(0));
    Table tbl;
    try {
      tbl = this.getTableObjectByName(tableName);
    } catch (InvalidTableException e) {
      throw new SemanticException(ErrorMsg.INVALID_TABLE.getMsg(tableName), e);
    }
    catch (HiveException e) {
      throw new SemanticException(e.getMessage(), e);
    }

    /* noscan uses hdfs apis to retrieve such information from Namenode.      */
    /* But that will be specific to hdfs. Through storagehandler mechanism,   */
    /* storage of table could be on any storage system: hbase, cassandra etc. */
    /* A nice error message should be given to user. */
    if (tbl.isNonNative()) {
      throw new SemanticException(ErrorMsg.ANALYZE_TABLE_NOSCAN_NON_NATIVE.getMsg(tbl
          .getTableName()));
    }
  }

  /**
   * Validate partialscan command
   *
   * @param tree
   * @throws SemanticException
   */
  private void validateAnalyzePartialscan(ASTNode tree) throws SemanticException {
    // since it is partialscan, it is true table name in command
    String tableName = getUnescapedName((ASTNode) tree.getChild(0).getChild(0));
    Table tbl;
    try {
      tbl = this.getTableObjectByName(tableName);
    } catch (InvalidTableException e) {
      throw new SemanticException(ErrorMsg.INVALID_TABLE.getMsg(tableName), e);
    } catch (HiveException e) {
      throw new SemanticException(e.getMessage(), e);
    }
    /* partialscan uses hdfs apis to retrieve such information from Namenode.      */
    /* But that will be specific to hdfs. Through storagehandler mechanism,   */
    /* storage of table could be on any storage system: hbase, cassandra etc. */
    /* A nice error message should be given to user. */
    if (tbl.isNonNative()) {
      throw new SemanticException(ErrorMsg.ANALYZE_TABLE_PARTIALSCAN_NON_NATIVE.getMsg(tbl
          .getTableName()));
    }

    /**
     * Partial scan doesn't support external table.
     */
    if(tbl.getTableType().equals(TableType.EXTERNAL_TABLE)) {
      throw new SemanticException(ErrorMsg.ANALYZE_TABLE_PARTIALSCAN_EXTERNAL_TABLE.getMsg(tbl
          .getTableName()));
    }

    if (!HiveConf.getBoolVar(conf, HiveConf.ConfVars.HIVESTATSAUTOGATHER)) {
      throw new SemanticException(ErrorMsg.ANALYZE_TABLE_PARTIALSCAN_AUTOGATHER.getMsg());
    }
  }

  /**
   * It will check if this is analyze ... compute statistics noscan
   * @param tree
   */
  private void checkNoScan(ASTNode tree) {
    if (tree.getChildCount() > 1) {
      ASTNode child0 = (ASTNode) tree.getChild(0);
      ASTNode child1;
      if (child0.getToken().getType() == HiveParser.TOK_TAB) {
        child0 = (ASTNode) child0.getChild(0);
        if (child0.getToken().getType() == HiveParser.TOK_TABNAME) {
          child1 = (ASTNode) tree.getChild(1);
          if (child1.getToken().getType() == HiveParser.KW_NOSCAN) {
            this.noscan = true;
          }
        }
      }
    }
  }

  /**
   * It will check if this is analyze ... compute statistics partialscan
   * @param tree
   */
  private void checkPartialScan(ASTNode tree) {
    if (tree.getChildCount() > 1) {
      ASTNode child0 = (ASTNode) tree.getChild(0);
      ASTNode child1;
      if (child0.getToken().getType() == HiveParser.TOK_TAB) {
        child0 = (ASTNode) child0.getChild(0);
        if (child0.getToken().getType() == HiveParser.TOK_TABNAME) {
          child1 = (ASTNode) tree.getChild(1);
          if (child1.getToken().getType() == HiveParser.KW_PARTIALSCAN) {
            this.partialscan = true;
          }
        }
      }
    }
  }


  public QB getQB() {
    return qb;
  }

  public void setQB(QB qb) {
    this.qb = qb;
  }

//--------------------------- PTF handling -----------------------------------

  /*
   * - a partitionTableFunctionSource can be a tableReference, a SubQuery or another
   *   PTF invocation.
   * - For a TABLEREF: set the source to the alias returned by processTable
   * - For a SubQuery: set the source to the alias returned by processSubQuery
   * - For a PTF invocation: recursively call processPTFChain.
   */
  private PTFInputSpec processPTFSource(QB qb, ASTNode inputNode) throws SemanticException{

    PTFInputSpec qInSpec = null;
    int type = inputNode.getType();
    String alias;
    switch(type)
    {
    case HiveParser.TOK_TABREF:
      alias = processTable(qb, inputNode);
      qInSpec = new PTFQueryInputSpec();
      ((PTFQueryInputSpec)qInSpec).setType(PTFQueryInputType.TABLE);
      ((PTFQueryInputSpec)qInSpec).setSource(alias);
      break;
    case HiveParser.TOK_SUBQUERY:
      alias = processSubQuery(qb, inputNode);
      qInSpec = new PTFQueryInputSpec();
      ((PTFQueryInputSpec)qInSpec).setType(PTFQueryInputType.SUBQUERY);
      ((PTFQueryInputSpec)qInSpec).setSource(alias);
      break;
    case HiveParser.TOK_PTBLFUNCTION:
      qInSpec = processPTFChain(qb, inputNode);
      break;
    default:
      throw new SemanticException(generateErrorMessage(inputNode,
          "Unknown input type to PTF"));
    }

    qInSpec.setAstNode(inputNode);
    return qInSpec;

  }

  /*
   * - tree form is
   *   ^(TOK_PTBLFUNCTION name alias? partitionTableFunctionSource partitioningSpec? arguments*)
   * - a partitionTableFunctionSource can be a tableReference, a SubQuery or another
   *   PTF invocation.
   */
  private PartitionedTableFunctionSpec processPTFChain(QB qb, ASTNode ptf)
      throws SemanticException{
    int child_count = ptf.getChildCount();
    if (child_count < 2) {
      throw new SemanticException(generateErrorMessage(ptf,
                  "Not enough Children " + child_count));
    }

    PartitionedTableFunctionSpec ptfSpec = new PartitionedTableFunctionSpec();
    ptfSpec.setAstNode(ptf);

    /*
     * name
     */
    ASTNode nameNode = (ASTNode) ptf.getChild(0);
    ptfSpec.setName(nameNode.getText());

    int inputIdx = 1;

    /*
     * alias
     */
    ASTNode secondChild = (ASTNode) ptf.getChild(1);
    if ( secondChild.getType() == HiveParser.Identifier ) {
      ptfSpec.setAlias(secondChild.getText());
      inputIdx++;
    }

    /*
     * input
     */
    ASTNode inputNode = (ASTNode) ptf.getChild(inputIdx);
    ptfSpec.setInput(processPTFSource(qb, inputNode));

    int argStartIdx = inputIdx + 1;

    /*
     * partitioning Spec
     */
    int pSpecIdx = inputIdx + 1;
    ASTNode pSpecNode = ptf.getChildCount() > inputIdx ?
        (ASTNode) ptf.getChild(pSpecIdx) : null;
    if (pSpecNode != null && pSpecNode.getType() == HiveParser.TOK_PARTITIONINGSPEC)
    {
      PartitioningSpec partitioning = processPTFPartitionSpec(pSpecNode);
      ptfSpec.setPartitioning(partitioning);
      argStartIdx++;
    }

    /*
     * arguments
     */
    for(int i=argStartIdx; i < ptf.getChildCount(); i++)
    {
      ptfSpec.addArg((ASTNode) ptf.getChild(i));
    }
    return ptfSpec;
  }

  /*
   * - invoked during FROM AST tree processing, on encountering a PTF invocation.
   * - tree form is
   *   ^(TOK_PTBLFUNCTION name partitionTableFunctionSource partitioningSpec? arguments*)
   * - setup a PTFInvocationSpec for this top level PTF invocation.
   */
  private void processPTF(QB qb, ASTNode ptf) throws SemanticException{

    PartitionedTableFunctionSpec ptfSpec = processPTFChain(qb, ptf);

    if ( ptfSpec.getAlias() != null ) {
      qb.addAlias(ptfSpec.getAlias());
    }

    PTFInvocationSpec spec = new PTFInvocationSpec();
    spec.setFunction(ptfSpec);
    qb.addPTFNodeToSpec(ptf, spec);
  }

  private void handleQueryWindowClauses(QB qb, Phase1Ctx ctx_1, ASTNode node)
      throws SemanticException {
    WindowingSpec spec = qb.getWindowingSpec(ctx_1.dest);
    for(int i=0; i < node.getChildCount(); i++) {
      processQueryWindowClause(spec, (ASTNode) node.getChild(i));
    }
  }

  private PartitionSpec processPartitionSpec(ASTNode node) {
    PartitionSpec pSpec = new PartitionSpec();
    int exprCnt = node.getChildCount();
    for(int i=0; i < exprCnt; i++) {
      PartitionExpression exprSpec = new PartitionExpression();
      exprSpec.setExpression((ASTNode) node.getChild(i));
      pSpec.addExpression(exprSpec);
    }
    return pSpec;
  }

  private OrderSpec processOrderSpec(ASTNode sortNode) {
    OrderSpec oSpec = new OrderSpec();
    int exprCnt = sortNode.getChildCount();
    for(int i=0; i < exprCnt; i++) {
      OrderExpression exprSpec = new OrderExpression();
      ASTNode orderSpec = (ASTNode) sortNode.getChild(i);
      ASTNode nullOrderSpec = (ASTNode) orderSpec.getChild(0);
      exprSpec.setExpression((ASTNode) nullOrderSpec.getChild(0));
      if ( orderSpec.getType() == HiveParser.TOK_TABSORTCOLNAMEASC ) {
        exprSpec.setOrder(org.apache.hadoop.hive.ql.parse.PTFInvocationSpec.Order.ASC);
      }
      else {
        exprSpec.setOrder(org.apache.hadoop.hive.ql.parse.PTFInvocationSpec.Order.DESC);
      }
      if ( nullOrderSpec.getType() == HiveParser.TOK_NULLS_FIRST ) {
        exprSpec.setNullOrder(org.apache.hadoop.hive.ql.parse.PTFInvocationSpec.NullOrder.NULLS_FIRST);
      } else {
        exprSpec.setNullOrder(org.apache.hadoop.hive.ql.parse.PTFInvocationSpec.NullOrder.NULLS_LAST);
      }
      oSpec.addExpression(exprSpec);
    }
    return oSpec;
  }

  private PartitioningSpec processPTFPartitionSpec(ASTNode pSpecNode)
  {
    PartitioningSpec partitioning = new PartitioningSpec();
    ASTNode firstChild = (ASTNode) pSpecNode.getChild(0);
    int type = firstChild.getType();
    int exprCnt;


    if ( type == HiveParser.TOK_DISTRIBUTEBY || type == HiveParser.TOK_CLUSTERBY )
    {
      PartitionSpec pSpec = processPartitionSpec(firstChild);
      partitioning.setPartSpec(pSpec);
      ASTNode sortNode = pSpecNode.getChildCount() > 1 ? (ASTNode) pSpecNode.getChild(1) : null;
      if ( sortNode != null )
      {
        OrderSpec oSpec = processOrderSpec(sortNode);
        partitioning.setOrderSpec(oSpec);
      }
    }
    else if ( type == HiveParser.TOK_SORTBY || type == HiveParser.TOK_ORDERBY ) {
      ASTNode sortNode = firstChild;
      OrderSpec oSpec = processOrderSpec(sortNode);
      partitioning.setOrderSpec(oSpec);
    }
    return partitioning;
  }

  private WindowFunctionSpec processWindowFunction(ASTNode node, ASTNode wsNode)
    throws SemanticException {
    WindowFunctionSpec wfSpec = new WindowFunctionSpec();

    switch(node.getType()) {
    case HiveParser.TOK_FUNCTIONSTAR:
      wfSpec.setStar(true);
      break;
    case HiveParser.TOK_FUNCTIONDI:
      wfSpec.setDistinct(true);
      break;
    }

    wfSpec.setExpression(node);

    ASTNode nameNode = (ASTNode) node.getChild(0);
    wfSpec.setName(nameNode.getText());

    for(int i=1; i < node.getChildCount()-1; i++) {
      ASTNode child = (ASTNode) node.getChild(i);
      wfSpec.addArg(child);
    }

    if ( wsNode != null ) {
      WindowSpec ws = processWindowSpec(wsNode);
      wfSpec.setWindowSpec(ws);
    }

    return wfSpec;
  }

  private boolean containsLeadLagUDF(ASTNode expressionTree) {
    int exprTokenType = expressionTree.getToken().getType();
    if (exprTokenType == HiveParser.TOK_FUNCTION) {
      assert (expressionTree.getChildCount() != 0);
      if (expressionTree.getChild(0).getType() == HiveParser.Identifier) {
        String functionName = unescapeIdentifier(expressionTree.getChild(0)
            .getText());
        functionName = functionName.toLowerCase();
        if ( FunctionRegistry.LAG_FUNC_NAME.equals(functionName) ||
            FunctionRegistry.LEAD_FUNC_NAME.equals(functionName)
            ) {
          return true;
        }
      }
    }
    for (int i = 0; i < expressionTree.getChildCount(); i++) {
      if ( containsLeadLagUDF((ASTNode) expressionTree.getChild(i))) {
        return true;
      }
    }
    return false;
  }

  private void processQueryWindowClause(WindowingSpec spec, ASTNode node)
      throws SemanticException {
    ASTNode nameNode = (ASTNode) node.getChild(0);
    ASTNode wsNode = (ASTNode) node.getChild(1);
    if(spec.getWindowSpecs() != null && spec.getWindowSpecs().containsKey(nameNode.getText())){
      throw new SemanticException(generateErrorMessage(nameNode,
          "Duplicate definition of window " + nameNode.getText() +
          " is not allowed"));
    }
    WindowSpec ws = processWindowSpec(wsNode);
    spec.addWindowSpec(nameNode.getText(), ws);
  }

  private WindowSpec processWindowSpec(ASTNode node) throws SemanticException {
    String sourceId = null;
    PartitionSpec partition = null;
    OrderSpec order = null;
    WindowFrameSpec windowFrame = null;

    boolean hasSrcId = false, hasPartSpec = false, hasWF = false;
    int srcIdIdx = -1, partIdx = -1, wfIdx = -1;

    for(int i=0; i < node.getChildCount(); i++)
    {
      int type = node.getChild(i).getType();
      switch(type)
      {
      case HiveParser.Identifier:
        hasSrcId = true; srcIdIdx = i;
        break;
      case HiveParser.TOK_PARTITIONINGSPEC:
        hasPartSpec = true; partIdx = i;
        break;
      case HiveParser.TOK_WINDOWRANGE:
      case HiveParser.TOK_WINDOWVALUES:
        hasWF = true; wfIdx = i;
        break;
      }
    }

    WindowSpec ws = new WindowSpec();

    if (hasSrcId) {
      ASTNode nameNode = (ASTNode) node.getChild(srcIdIdx);
      ws.setSourceId(nameNode.getText());
    }

    if (hasPartSpec) {
      ASTNode partNode = (ASTNode) node.getChild(partIdx);
      PartitioningSpec partitioning = processPTFPartitionSpec(partNode);
      ws.setPartitioning(partitioning);
    }

    if ( hasWF)
    {
      ASTNode wfNode = (ASTNode) node.getChild(wfIdx);
      WindowFrameSpec wfSpec = processWindowFrame(wfNode);
      ws.setWindowFrame(wfSpec);
    }

    return ws;
  }

  private WindowFrameSpec processWindowFrame(ASTNode node) throws SemanticException {
    int type = node.getType();
    BoundarySpec start = null, end = null;

    /*
     * A WindowFrame may contain just the Start Boundary or in the
     * between style of expressing a WindowFrame both boundaries
     * are specified.
     */
    start = processBoundary(type, (ASTNode) node.getChild(0));
    if ( node.getChildCount() > 1 ) {
      end = processBoundary(type, (ASTNode) node.getChild(1));
    }
    // Note: TOK_WINDOWVALUES means RANGE type, TOK_WINDOWRANGE means ROWS type
    return new WindowFrameSpec(type == HiveParser.TOK_WINDOWVALUES ? WindowType.RANGE : WindowType.ROWS, start, end);
  }

  private BoundarySpec processBoundary(int frameType, ASTNode node)  throws SemanticException {
    BoundarySpec bs = new BoundarySpec();
    int type = node.getType();
    boolean hasAmt = true;

    switch(type)
    {
    case HiveParser.KW_PRECEDING:
      bs.setDirection(Direction.PRECEDING);
      break;
    case HiveParser.KW_FOLLOWING:
      bs.setDirection(Direction.FOLLOWING);
      break;
    case HiveParser.KW_CURRENT:
      bs.setDirection(Direction.CURRENT);
      hasAmt = false;
      break;
    }

    if ( hasAmt )
    {
      ASTNode amtNode = (ASTNode) node.getChild(0);
      if ( amtNode.getType() == HiveParser.KW_UNBOUNDED)
      {
        bs.setAmt(BoundarySpec.UNBOUNDED_AMOUNT);
      }
      else
      {
        int amt = Integer.parseInt(amtNode.getText());
        if ( amt <= 0 ) {
          throw new SemanticException(
              "Window Frame Boundary Amount must be a positive integer, provided amount is: " + amt);
        }
        bs.setAmt(amt);
      }
    }

    return bs;
  }

  /*
   * check if a Select Expr is a constant.
   * - current logic used is to look for HiveParser.TOK_TABLE_OR_COL
   * - if there is none then the expression is a constant.
   */
  private static class ConstantExprCheck implements ContextVisitor {
    boolean isConstant = true;

    @Override
    public void visit(Object t, Object parent, int childIndex, Map labels) {
      if ( !isConstant ) {
        return;
      }
      ASTNode node = (ASTNode) t;
      if (ParseDriver.adaptor.getType(t) == HiveParser.TOK_TABLE_OR_COL ) {
        isConstant = false;
      }
    }

    public void reset() {
      isConstant = true;
    }

    protected boolean isConstant() {
      return isConstant;
    }
  }

  private static class AggregationExprCheck implements ContextVisitor {
    HashMap destAggrExprs;
    boolean isAggr = false;

    public AggregationExprCheck(HashMap destAggrExprs) {
      super();
      this.destAggrExprs = destAggrExprs;
    }

    @Override
    public void visit(Object t, Object parent, int childIndex, Map labels) {
      if ( isAggr ) {
        return;
      }
      if ( destAggrExprs.values().contains(t)) {
        isAggr = true;
      }
    }

    public void reset() {
      isAggr = false;
    }

    protected boolean isAggr() {
      return isAggr;
    }
  }

  /*
   * Returns false if there is a SelectExpr that is not a constant or an aggr.
   *
   */
  private boolean isValidGroupBySelectList(QB currQB, String clause){
    ConstantExprCheck constantExprCheck = new ConstantExprCheck();
    AggregationExprCheck aggrExprCheck = new AggregationExprCheck(
        currQB.getParseInfo().getAggregationExprsForClause(clause));

    TreeWizard tw = new TreeWizard(ParseDriver.adaptor, HiveParser.tokenNames);
    ASTNode selectNode = currQB.getParseInfo().getSelForClause(clause);

    /*
     * for Select Distinct Queries we don't move any aggregations.
     */
    if ( selectNode != null && selectNode.getType() == HiveParser.TOK_SELECTDI ) {
      return true;
    }

    for (int i = 0; selectNode != null && i < selectNode.getChildCount(); i++) {
      ASTNode selectExpr = (ASTNode) selectNode.getChild(i);
      //check for QUERY_HINT expressions on ast
      if(selectExpr.getType() != HiveParser.TOK_SELEXPR){
        continue;
      }

      constantExprCheck.reset();
      PTFTranslator.visit(selectExpr.getChild(0), constantExprCheck);

      if ( !constantExprCheck.isConstant() ) {
        aggrExprCheck.reset();
        PTFTranslator.visit(selectExpr.getChild(0), aggrExprCheck);
        if (!aggrExprCheck.isAggr() ) {
          return false;
        }
      }

    }
    return true;
  }

//--------------------------- PTF handling: PTFInvocationSpec to PTFDesc --------------------------

  private PTFDesc translatePTFInvocationSpec(PTFInvocationSpec ptfQSpec, RowResolver inputRR)
      throws SemanticException{
    PTFDesc ptfDesc = null;
    PTFTranslator translator = new PTFTranslator();
    ptfDesc = translator.translate(ptfQSpec, this, conf, inputRR, unparseTranslator);
    return ptfDesc;
  }

  Operator genPTFPlan(PTFInvocationSpec ptfQSpec, Operator input) throws SemanticException {
    ArrayList componentQueries = PTFTranslator.componentize(ptfQSpec);
    for (PTFInvocationSpec ptfSpec : componentQueries) {
      input = genPTFPlanForComponentQuery(ptfSpec, input);
    }
    if (LOG.isDebugEnabled()) {
      LOG.debug("Created PTF Plan ");
    }
    return input;
  }


  /**
   * Construct the data structures containing ExprNodeDesc for partition
   * columns and order columns. Use the input definition to construct the list
   * of output columns for the ReduceSinkOperator
   *
   * @throws SemanticException
   */
  void buildPTFReduceSinkDetails(PartitionedTableFunctionDef tabDef,
      RowResolver inputRR,
      ArrayList partCols,
      ArrayList orderCols,
      StringBuilder orderString,
      StringBuilder nullOrderString) throws SemanticException {

    List partColList = tabDef.getPartition().getExpressions();

    for (PTFExpressionDef colDef : partColList) {
      ExprNodeDesc exprNode = colDef.getExprNode();
      if (ExprNodeDescUtils.indexOf(exprNode, partCols) < 0) {
        partCols.add(exprNode);
        orderCols.add(exprNode);
        orderString.append('+');
        nullOrderString.append('a');
      }
    }

    /*
     * Order columns are used as key columns for constructing
     * the ReduceSinkOperator
     * Since we do not explicitly add these to outputColumnNames,
     * we need to set includeKeyCols = false while creating the
     * ReduceSinkDesc
     */
    List orderColList = tabDef.getOrder().getExpressions();
    for (int i = 0; i < orderColList.size(); i++) {
      OrderExpressionDef colDef = orderColList.get(i);
      char orderChar = colDef.getOrder() == PTFInvocationSpec.Order.ASC ? '+' : '-';
      char nullOrderChar = colDef.getNullOrder() == PTFInvocationSpec.NullOrder.NULLS_FIRST ? 'a' : 'z';
      int index = ExprNodeDescUtils.indexOf(colDef.getExprNode(), orderCols);
      if (index >= 0) {
        orderString.setCharAt(index, orderChar);
        nullOrderString.setCharAt(index, nullOrderChar);
        continue;
      }
      orderCols.add(colDef.getExprNode());
      orderString.append(orderChar);
      nullOrderString.append(nullOrderChar);
    }
  }

  private Operator genPTFPlanForComponentQuery(PTFInvocationSpec ptfQSpec, Operator input)
      throws SemanticException {
    /*
     * 1. Create the PTFDesc from the Qspec attached to this QB.
     */
    RowResolver rr = opParseCtx.get(input).getRowResolver();
    PTFDesc ptfDesc = translatePTFInvocationSpec(ptfQSpec, rr);

    /*
     * 2. build Map-side Op Graph. Graph template is either:
     * Input -> PTF_map -> ReduceSink
     * or
     * Input -> ReduceSink
     *
     * Here the ExprNodeDescriptors in the QueryDef are based on the Input Operator's RR.
     */
    {
      PartitionedTableFunctionDef tabDef = ptfDesc.getStartOfChain();

      /*
       * a. add Map-side PTF Operator if needed
       */
      if (tabDef.isTransformsRawInput() )
      {
        RowResolver ptfMapRR = tabDef.getRawInputShape().getRr();

        ptfDesc.setMapSide(true);
        input = putOpInsertMap(OperatorFactory.getAndMakeChild(ptfDesc,
            new RowSchema(ptfMapRR.getColumnInfos()), input), ptfMapRR);
        rr = opParseCtx.get(input).getRowResolver();
      }

      /*
       * b. Build Reduce Sink Details (keyCols, valueCols, outColNames etc.) for this ptfDesc.
       */

      ArrayList partCols = new ArrayList();
      ArrayList orderCols = new ArrayList();
      StringBuilder orderString = new StringBuilder();
      StringBuilder nullOrderString = new StringBuilder();

      /*
       * Use the input RR of TableScanOperator in case there is no map-side
       * reshape of input.
       * If the parent of ReduceSinkOperator is PTFOperator, use it's
       * output RR.
       */
      buildPTFReduceSinkDetails(tabDef, rr, partCols, orderCols, orderString, nullOrderString);
      input = genReduceSinkPlan(input, partCols, orderCols, orderString.toString(),
              nullOrderString.toString(), -1, Operation.NOT_ACID);
    }

    /*
     * 3. build Reduce-side Op Graph
     */
    {

      /*
       * c. Rebuilt the QueryDef.
       * Why?
       * - so that the ExprNodeDescriptors in the QueryDef are based on the
       *   Select Operator's RowResolver
       */
      rr = opParseCtx.get(input).getRowResolver();
      ptfDesc = translatePTFInvocationSpec(ptfQSpec, rr);

      /*
       * d. Construct PTF Operator.
       */
      RowResolver ptfOpRR = ptfDesc.getFuncDef().getOutputShape().getRr();
      input = putOpInsertMap(OperatorFactory.getAndMakeChild(ptfDesc,
          new RowSchema(ptfOpRR.getColumnInfos()),
          input), ptfOpRR);

    }
    return input;
  }

//--------------------------- Windowing handling: PTFInvocationSpec to PTFDesc --------------------

  Operator genWindowingPlan(QB qb, WindowingSpec wSpec, Operator input) throws SemanticException {
    wSpec.validateAndMakeEffective();

    if (!isCBOExecuted() && !qb.getParseInfo().getDestToGroupBy().isEmpty()) {
      // If CBO did not optimize the query, we might need to replace grouping function
      final String selClauseName = qb.getParseInfo().getClauseNames().iterator().next();
      final boolean cubeRollupGrpSetPresent = (!qb.getParseInfo().getDestRollups().isEmpty()
              || !qb.getParseInfo().getDestGroupingSets().isEmpty()
              || !qb.getParseInfo().getDestCubes().isEmpty());
      for (WindowExpressionSpec wExprSpec : wSpec.getWindowExpressions()) {
        // Special handling of grouping function
        wExprSpec.setExpression(rewriteGroupingFunctionAST(
                getGroupByForClause(qb.getParseInfo(), selClauseName), wExprSpec.getExpression(),
                !cubeRollupGrpSetPresent));
      }
    }

    WindowingComponentizer groups = new WindowingComponentizer(wSpec);
    RowResolver rr = opParseCtx.get(input).getRowResolver();

    while(groups.hasNext() ) {
      wSpec = groups.next(conf, this, unparseTranslator, rr);
      input = genReduceSinkPlanForWindowing(wSpec, rr, input);
      rr = opParseCtx.get(input).getRowResolver();
      PTFTranslator translator = new PTFTranslator();
      PTFDesc ptfDesc = translator.translate(wSpec, this, conf, rr, unparseTranslator);
      RowResolver ptfOpRR = ptfDesc.getFuncDef().getOutputShape().getRr();
      input = putOpInsertMap(OperatorFactory.getAndMakeChild(ptfDesc,
          new RowSchema(ptfOpRR.getColumnInfos()), input), ptfOpRR);
      input = genSelectAllDesc(input);
      rr = ptfOpRR;
    }

    return input;
  }

  private Operator genReduceSinkPlanForWindowing(WindowingSpec spec,
      RowResolver inputRR, Operator input) throws SemanticException{

    ArrayList partCols = new ArrayList();
    ArrayList orderCols = new ArrayList();
    StringBuilder order = new StringBuilder();
    StringBuilder nullOrder = new StringBuilder();

    for (PartitionExpression partCol : spec.getQueryPartitionSpec().getExpressions()) {
      ExprNodeDesc partExpr = genExprNodeDesc(partCol.getExpression(), inputRR);
      if (ExprNodeDescUtils.indexOf(partExpr, partCols) < 0) {
        partCols.add(partExpr);
        orderCols.add(partExpr);
        order.append('+');
        nullOrder.append('a');
      }
    }

    if (spec.getQueryOrderSpec() != null) {
      for (OrderExpression orderCol : spec.getQueryOrderSpec().getExpressions()) {
        ExprNodeDesc orderExpr = genExprNodeDesc(orderCol.getExpression(), inputRR);
        char orderChar = orderCol.getOrder() == PTFInvocationSpec.Order.ASC ? '+' : '-';
        char nullOrderChar = orderCol.getNullOrder() == PTFInvocationSpec.NullOrder.NULLS_FIRST ? 'a' : 'z';
        int index = ExprNodeDescUtils.indexOf(orderExpr, orderCols);
        if (index >= 0) {
          order.setCharAt(index, orderChar);
          nullOrder.setCharAt(index, nullOrderChar);
          continue;
        }
        orderCols.add(genExprNodeDesc(orderCol.getExpression(), inputRR));
        order.append(orderChar);
        nullOrder.append(nullOrderChar);
      }
    }

    return genReduceSinkPlan(input, partCols, orderCols, order.toString(), nullOrder.toString(),
            -1, Operation.NOT_ACID);
  }

  public static ArrayList parseSelect(String selectExprStr)
      throws SemanticException
  {
    ASTNode selNode = null;
    try {
      ParseDriver pd = new ParseDriver();
      selNode = pd.parseSelect(selectExprStr, null);
    } catch (ParseException pe) {
      throw new SemanticException(pe);
    }

    ArrayList selSpec = new ArrayList();
    int childCount = selNode.getChildCount();
    for (int i = 0; i < childCount; i++) {
      ASTNode selExpr = (ASTNode) selNode.getChild(i);
      if (selExpr.getType() != HiveParser.TOK_SELEXPR) {
        throw new SemanticException(String.format(
            "Only Select expressions supported in dynamic select list: %s", selectExprStr));
      }
      ASTNode expr = (ASTNode) selExpr.getChild(0);
      if (expr.getType() == HiveParser.TOK_ALLCOLREF) {
        throw new SemanticException(
            String.format("'%s' column not allowed in dynamic select list", selectExprStr));
      }
      ASTNode aliasNode = selExpr.getChildCount() > 1
          && selExpr.getChild(1).getType() == HiveParser.Identifier ?
          (ASTNode) selExpr.getChild(1) : null;
      String alias = null;
      if ( aliasNode != null ) {
        alias = aliasNode.getText();
      }
      else {
        String[] tabColAlias = getColAlias(selExpr, null, null, true, -1);
        alias = tabColAlias[1];
      }
      WindowExpressionSpec exprSpec = new WindowExpressionSpec();
      exprSpec.setAlias(alias);
      exprSpec.setExpression(expr);
      selSpec.add(exprSpec);
    }

    return selSpec;
  }

  private void addAlternateGByKeyMappings(ASTNode gByExpr, ColumnInfo colInfo,
      Operator reduceSinkOp, RowResolver gByRR) {
    if ( gByExpr.getType() == HiveParser.DOT
          && gByExpr.getChild(0).getType() == HiveParser.TOK_TABLE_OR_COL ) {
      String tab_alias = BaseSemanticAnalyzer.unescapeIdentifier(gByExpr
                .getChild(0).getChild(0).getText().toLowerCase());
      String col_alias = BaseSemanticAnalyzer.unescapeIdentifier(
          gByExpr.getChild(1).getText().toLowerCase());
      gByRR.put(tab_alias, col_alias, colInfo);
    } else if ( gByExpr.getType() == HiveParser.TOK_TABLE_OR_COL ) {
      String col_alias = BaseSemanticAnalyzer.unescapeIdentifier(gByExpr
              .getChild(0).getText().toLowerCase());
      String tab_alias = null;
      /*
       * If the input to the GBy has a tab alias for the column, then add an entry
       * based on that tab_alias.
       * For e.g. this query:
       * select b.x, count(*) from t1 b group by x
       * needs (tab_alias=b, col_alias=x) in the GBy RR.
       * tab_alias=b comes from looking at the RowResolver that is the ancestor
       * before any GBy/ReduceSinks added for the GBY operation.
       */
      Operator parent = reduceSinkOp;
      while ( parent instanceof ReduceSinkOperator ||
          parent instanceof GroupByOperator ) {
        parent = parent.getParentOperators().get(0);
      }
      RowResolver parentRR = opParseCtx.get(parent).getRowResolver();
      try {
        ColumnInfo pColInfo = parentRR.get(tab_alias, col_alias);
        tab_alias = pColInfo == null ? null : pColInfo.getTabAlias();
      } catch(SemanticException se) {
      }
      gByRR.put(tab_alias, col_alias, colInfo);
    }
  }

  private WriteEntity.WriteType determineWriteType(LoadTableDesc ltd, boolean isNonNativeTable, String dest) {
    // Don't know the characteristics of non-native tables,
    // and don't have a rational way to guess, so assume the most
    // conservative case.
    if (isNonNativeTable) return WriteEntity.WriteType.INSERT_OVERWRITE;
    else return (ltd.getReplace() ? WriteEntity.WriteType.INSERT_OVERWRITE :
      getWriteType(dest));
  }

  private WriteEntity.WriteType getWriteType(String dest) {
    return updating(dest) ? WriteEntity.WriteType.UPDATE :
      (deleting(dest) ? WriteEntity.WriteType.DELETE : WriteEntity.WriteType.INSERT);
  }
  private boolean isAcidOutputFormat(Class of) {
    Class[] interfaces = of.getInterfaces();
    for (Class iface : interfaces) {
      if (iface.equals(AcidOutputFormat.class)) {
        return true;
      }
    }
    return false;
  }

  // Note that this method assumes you have already decided this is an Acid table.  It cannot
  // figure out if a table is Acid or not.
  private AcidUtils.Operation getAcidType(String destination) {
    return deleting(destination) ? AcidUtils.Operation.DELETE :
        (updating(destination) ? AcidUtils.Operation.UPDATE :
            AcidUtils.Operation.INSERT);
  }

  private AcidUtils.Operation getAcidType(Class of, String dest) {
    if (SessionState.get() == null || !SessionState.get().getTxnMgr().supportsAcid()) {
      return AcidUtils.Operation.NOT_ACID;
    } else if (isAcidOutputFormat(of)) {
      return getAcidType(dest);
    } else {
      return AcidUtils.Operation.NOT_ACID;
    }
  }

  protected boolean updating(String destination) {
    return destination.startsWith(Context.DestClausePrefix.UPDATE.toString());
  }

  protected boolean deleting(String destination) {
    return destination.startsWith(Context.DestClausePrefix.DELETE.toString());
  }

  // Make sure the proper transaction manager that supports ACID is being used
  protected void checkAcidTxnManager(Table table) throws SemanticException {
    if (SessionState.get() != null && !SessionState.get().getTxnMgr().supportsAcid()) {
      throw new SemanticException(ErrorMsg.TXNMGR_NOT_ACID, table.getDbName(), table.getTableName());
    }
  }

  public static ASTNode genSelectDIAST(RowResolver rr) {
    LinkedHashMap> map = rr.getRslvMap();
    ASTNode selectDI = new ASTNode(new CommonToken(HiveParser.TOK_SELECTDI, "TOK_SELECTDI"));
    // Note: this will determine the order of columns in the result. For now, the columns for each
    //       table will be together; the order of the tables, as well as the columns within each
    //       table, is deterministic, but undefined - RR stores them in the order of addition.
    for (String tabAlias : map.keySet()) {
      for (Entry entry : map.get(tabAlias).entrySet()) {
        selectDI.addChild(buildSelExprSubTree(tabAlias, entry.getKey()));
      }
    }
    return selectDI;
  }
  private static ASTNode buildSelExprSubTree(String tableAlias, String col) {
    ASTNode selexpr = new ASTNode(new CommonToken(HiveParser.TOK_SELEXPR, "TOK_SELEXPR"));
    ASTNode tableOrCol = new ASTNode(new CommonToken(HiveParser.TOK_TABLE_OR_COL,
        "TOK_TABLE_OR_COL"));
    ASTNode dot = new ASTNode(new CommonToken(HiveParser.DOT, "."));
    tableOrCol.addChild(new ASTNode(new CommonToken(HiveParser.Identifier, tableAlias)));
    dot.addChild(tableOrCol);
    dot.addChild(new ASTNode(new CommonToken(HiveParser.Identifier, col)));
    selexpr.addChild(dot);
    return selexpr;
  }

  private void copyInfoToQueryProperties(QueryProperties queryProperties) {
    if (qb != null) {
      queryProperties.setQuery(qb.getIsQuery());
      queryProperties.setAnalyzeCommand(qb.getParseInfo().isAnalyzeCommand());
      queryProperties.setPartialScanAnalyzeCommand(qb.getParseInfo().isPartialScanAnalyzeCommand());
      queryProperties.setNoScanAnalyzeCommand(qb.getParseInfo().isNoScanAnalyzeCommand());
      queryProperties.setAnalyzeRewrite(qb.isAnalyzeRewrite());
      queryProperties.setCTAS(qb.getTableDesc() != null);
      queryProperties.setHasOuterOrderBy(!qb.getParseInfo().getIsSubQ() &&
              !qb.getParseInfo().getDestToOrderBy().isEmpty());
      queryProperties.setOuterQueryLimit(qb.getParseInfo().getOuterQueryLimit());
      queryProperties.setMaterializedView(qb.getViewDesc() != null);
    }
  }
  private void warn(String msg) {
    SessionState.getConsole().printInfo(
        String.format("Warning: %s", msg));
  }

  public List getLoadFileWork() {
    return loadFileWork;
  }

  public void setLoadFileWork(List loadFileWork) {
    this.loadFileWork = loadFileWork;
  }

}