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/**
* 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.plan;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.BitSet;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.hive.ql.io.AcidUtils;
import org.apache.hadoop.hive.ql.metadata.Table;
import org.apache.hadoop.hive.ql.metadata.VirtualColumn;
import org.apache.hadoop.hive.ql.parse.TableSample;
import org.apache.hadoop.hive.ql.plan.Explain.Level;
import org.apache.hadoop.hive.serde.serdeConstants;
/**
* Table Scan Descriptor Currently, data is only read from a base source as part
* of map-reduce framework. So, nothing is stored in the descriptor. But, more
* things will be added here as table scan is invoked as part of local work.
**/
@Explain(displayName = "TableScan", explainLevels = { Level.USER, Level.DEFAULT, Level.EXTENDED })
public class TableScanDesc extends AbstractOperatorDesc {
private static final long serialVersionUID = 1L;
private String alias;
private List virtualCols;
private String statsAggKeyPrefix; // stats publishing/aggregating key prefix
/**
* A list of the partition columns of the table.
* Set by the semantic analyzer only in case of the analyze command.
*/
private List partColumns;
/**
* Used for split sampling (row count per split)
* For example,
* select count(1) from ss_src2 tablesample (10 ROWS) s;
* provides first 10 rows from all input splits
*/
private int rowLimit = -1;
/**
* A boolean variable set to true by the semantic analyzer only in case of the analyze command.
*
*/
private boolean gatherStats;
private boolean statsReliable;
private String tmpStatsDir;
private ExprNodeGenericFuncDesc filterExpr;
private transient Serializable filterObject;
private String serializedFilterExpr;
private String serializedFilterObject;
// Both neededColumnIDs and neededColumns should never be null.
// When neededColumnIDs is an empty list,
// it means no needed column (e.g. we do not need any column to evaluate
// SELECT count(*) FROM t).
private List neededColumnIDs;
private List neededColumns;
// all column names referenced including virtual columns. used in ColumnAccessAnalyzer
private transient List referencedColumns;
public static final String FILTER_EXPR_CONF_STR =
"hive.io.filter.expr.serialized";
public static final String FILTER_TEXT_CONF_STR =
"hive.io.filter.text";
public static final String FILTER_OBJECT_CONF_STR =
"hive.io.filter.object";
// input file name (big) to bucket number
private Map bucketFileNameMapping;
private boolean isMetadataOnly = false;
private boolean isAcidTable;
private transient TableSample tableSample;
private transient Table tableMetadata;
private BitSet includedBuckets;
private int numBuckets = -1;
public TableScanDesc() {
this(null, null);
}
@SuppressWarnings("nls")
public TableScanDesc(Table tblMetadata) {
this(null, tblMetadata);
}
public TableScanDesc(final String alias, Table tblMetadata) {
this(alias, null, tblMetadata);
}
public TableScanDesc(final String alias, List vcs, Table tblMetadata) {
this.alias = alias;
this.virtualCols = vcs;
this.tableMetadata = tblMetadata;
isAcidTable = AcidUtils.isAcidTable(this.tableMetadata);
}
@Override
public Object clone() {
List vcs = new ArrayList(getVirtualCols());
return new TableScanDesc(getAlias(), vcs, this.tableMetadata);
}
@Explain(displayName = "alias")
public String getAlias() {
return alias;
}
@Explain(explainLevels = { Level.USER })
public String getTbl() {
StringBuffer sb = new StringBuffer();
sb.append(this.tableMetadata.getCompleteName());
sb.append("," + alias);
if (isAcidTable()) {
sb.append(", ACID table");
}
sb.append(",Tbl:");
sb.append(this.statistics.getBasicStatsState());
sb.append(",Col:");
sb.append(this.statistics.getColumnStatsState());
return sb.toString();
}
public boolean isAcidTable() {
return isAcidTable;
}
@Explain(displayName = "Output", explainLevels = { Level.USER })
public List getOutputColumnNames() {
return this.neededColumns;
}
@Explain(displayName = "filterExpr")
public String getFilterExprString() {
return PlanUtils.getExprListString(Arrays.asList(filterExpr));
}
public ExprNodeGenericFuncDesc getFilterExpr() {
return filterExpr;
}
public void setFilterExpr(ExprNodeGenericFuncDesc filterExpr) {
this.filterExpr = filterExpr;
}
public Serializable getFilterObject() {
return filterObject;
}
public void setFilterObject(Serializable filterObject) {
this.filterObject = filterObject;
}
public void setNeededColumnIDs(List neededColumnIDs) {
this.neededColumnIDs = neededColumnIDs;
}
public List getNeededColumnIDs() {
return neededColumnIDs;
}
public void setNeededColumns(List neededColumns) {
this.neededColumns = neededColumns;
}
public List getNeededColumns() {
return neededColumns;
}
public void setReferencedColumns(List referencedColumns) {
this.referencedColumns = referencedColumns;
}
public List getReferencedColumns() {
return referencedColumns;
}
public void setAlias(String alias) {
this.alias = alias;
}
public void setPartColumns (List partColumns) {
this.partColumns = partColumns;
}
public List getPartColumns () {
return partColumns;
}
public void setGatherStats(boolean gatherStats) {
this.gatherStats = gatherStats;
}
@Explain(displayName = "GatherStats", explainLevels = { Level.EXTENDED })
public boolean isGatherStats() {
return gatherStats;
}
public String getTmpStatsDir() {
return tmpStatsDir;
}
public void setTmpStatsDir(String tmpStatsDir) {
this.tmpStatsDir = tmpStatsDir;
}
public List getVirtualCols() {
return virtualCols;
}
public void setVirtualCols(List virtualCols) {
this.virtualCols = virtualCols;
}
public void addVirtualCols(List virtualCols) {
this.virtualCols.addAll(virtualCols);
}
public boolean hasVirtualCols() {
return virtualCols != null && !virtualCols.isEmpty();
}
public void setStatsAggPrefix(String k) {
statsAggKeyPrefix = k;
}
@Explain(displayName = "Statistics Aggregation Key Prefix", explainLevels = { Level.EXTENDED })
public String getStatsAggPrefix() {
return statsAggKeyPrefix;
}
public boolean isStatsReliable() {
return statsReliable;
}
public void setStatsReliable(boolean statsReliable) {
this.statsReliable = statsReliable;
}
public void setRowLimit(int rowLimit) {
this.rowLimit = rowLimit;
}
public int getRowLimit() {
return rowLimit;
}
@Explain(displayName = "Row Limit Per Split")
public Integer getRowLimitExplain() {
return rowLimit >= 0 ? rowLimit : null;
}
public Map getBucketFileNameMapping() {
return bucketFileNameMapping;
}
public void setBucketFileNameMapping(Map bucketFileNameMapping) {
this.bucketFileNameMapping = bucketFileNameMapping;
}
public void setIsMetadataOnly(boolean metadata_only) {
isMetadataOnly = metadata_only;
}
public boolean getIsMetadataOnly() {
return isMetadataOnly;
}
public Table getTableMetadata() {
return tableMetadata;
}
public void setTableMetadata(Table tableMetadata) {
this.tableMetadata = tableMetadata;
}
public TableSample getTableSample() {
return tableSample;
}
public void setTableSample(TableSample tableSample) {
this.tableSample = tableSample;
}
public String getSerializedFilterExpr() {
return serializedFilterExpr;
}
public void setSerializedFilterExpr(String serializedFilterExpr) {
this.serializedFilterExpr = serializedFilterExpr;
}
public String getSerializedFilterObject() {
return serializedFilterObject;
}
public void setSerializedFilterObject(String serializedFilterObject) {
this.serializedFilterObject = serializedFilterObject;
}
public void setIncludedBuckets(BitSet bitset) {
this.includedBuckets = bitset;
}
public BitSet getIncludedBuckets() {
return this.includedBuckets;
}
@Explain(displayName = "buckets included", explainLevels = { Level.EXTENDED })
public String getIncludedBucketExplain() {
if (this.includedBuckets == null) {
return null;
}
StringBuilder sb = new StringBuilder();
sb.append("[");
for (int i = 0; i < this.includedBuckets.size(); i++) {
if (this.includedBuckets.get(i)) {
sb.append(i);
sb.append(',');
}
}
sb.append(String.format("] of %d", numBuckets));
return sb.toString();
}
public int getNumBuckets() {
return numBuckets;
}
public void setNumBuckets(int numBuckets) {
this.numBuckets = numBuckets;
}
public boolean isNeedSkipHeaderFooters() {
boolean rtn = false;
if (tableMetadata != null && tableMetadata.getTTable() != null) {
Map params = tableMetadata.getTTable().getParameters();
if (params != null) {
String skipHVal = params.get(serdeConstants.HEADER_COUNT);
int hcount = skipHVal == null? 0 : Integer.parseInt(skipHVal);
String skipFVal = params.get(serdeConstants.FOOTER_COUNT);
int fcount = skipFVal == null? 0 : Integer.parseInt(skipFVal);
rtn = (hcount != 0 || fcount !=0 );
}
}
return rtn;
}
}
