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org.apache.hadoop.hive.ql.parse.SubQueryUtils 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 java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Deque;
import java.util.List;
import java.util.Map;
import org.antlr.runtime.tree.CommonTreeAdaptor;
import org.apache.hadoop.hive.ql.Context;
import org.apache.hadoop.hive.ql.ErrorMsg;
import org.apache.hadoop.hive.ql.exec.ColumnInfo;
import org.apache.hadoop.hive.ql.exec.FunctionRegistry;
import org.apache.hadoop.hive.ql.exec.Operator;
import org.apache.hadoop.hive.ql.parse.QBSubQuery.SubQueryType;
import org.apache.hadoop.hive.ql.parse.QBSubQuery.SubQueryTypeDef;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDAFCount;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDAFResolver;
public class SubQueryUtils {
static void extractConjuncts(ASTNode node, List conjuncts) {
if (node.getType() != HiveParser.KW_AND ) {
conjuncts.add(node);
return;
}
extractConjuncts((ASTNode)node.getChild(0), conjuncts);
extractConjuncts((ASTNode)node.getChild(1), conjuncts);
}
/*
* Remove the SubQuery from the Where Clause Tree.
* return the remaining WhereClause.
*/
static ASTNode rewriteParentQueryWhere(ASTNode whereCond, ASTNode subQuery)
throws SemanticException {
ParentQueryWhereClauseRewrite rewrite =
new ParentQueryWhereClauseRewrite(whereCond, subQuery);
return rewrite.remove();
}
static ASTNode constructTrueCond() {
ASTNode eq = (ASTNode) ParseDriver.adaptor.create(HiveParser.EQUAL, "=");
ASTNode lhs = (ASTNode) ParseDriver.adaptor.create(HiveParser.Number, "1");
ASTNode rhs = (ASTNode) ParseDriver.adaptor.create(HiveParser.Number, "1");
ParseDriver.adaptor.addChild(eq, lhs);
ParseDriver.adaptor.addChild(eq, rhs);
return eq;
}
static ASTNode andAST(ASTNode left, ASTNode right) {
if ( left == null ) {
return right;
} else if ( right == null ) {
return left;
} else {
Object o = ParseDriver.adaptor.create(HiveParser.KW_AND, "AND");
ParseDriver.adaptor.addChild(o, left);
ParseDriver.adaptor.addChild(o, right);
return (ASTNode) o;
}
}
static ASTNode orAST(ASTNode left, ASTNode right) {
if ( left == null ) {
return right;
} else if ( right == null ) {
return left;
} else {
Object o = ParseDriver.adaptor.create(HiveParser.KW_OR, "OR");
ParseDriver.adaptor.addChild(o, left);
ParseDriver.adaptor.addChild(o, right);
return (ASTNode) o;
}
}
static ASTNode isNull(ASTNode expr) {
ASTNode node = (ASTNode) ParseDriver.adaptor.create(HiveParser.TOK_FUNCTION, "TOK_FUNCTION");
node.addChild((ASTNode) ParseDriver.adaptor.create(HiveParser.TOK_ISNULL, "TOK_ISNULL"));
node.addChild(expr);
return node;
}
/*
* Check that SubQuery is a top level conjuncts.
* Remove it from the Where Clause AST.
*/
static class ParentQueryWhereClauseRewrite {
ASTNode root;
ASTNode subQuery;
ParentQueryWhereClauseRewrite(ASTNode root, ASTNode subQuery) {
this.root = root;
this.subQuery = subQuery;
}
ASTNode getParentInWhereClause(ASTNode node) {
if (node == null || node == root) {
return null;
}
return (ASTNode) node.getParent();
}
boolean removeSubQuery(ASTNode node) {
if (node.getType() == HiveParser.KW_AND) {
boolean r = removeSubQuery((ASTNode) node.getChild(0));
if (!r) {
r = removeSubQuery((ASTNode) node.getChild(1));
}
return r;
} else if (node.getType() == HiveParser.KW_NOT) {
ASTNode child = (ASTNode) node.getChild(0);
if (child == subQuery) {
ASTNode sqOpType = (ASTNode) subQuery.getChild(0).getChild(0);
if (sqOpType.getType() == HiveParser.KW_EXISTS) {
sqOpType.getToken().setType(HiveParser.TOK_SUBQUERY_OP_NOTEXISTS);
} else {
sqOpType.getToken().setType(HiveParser.TOK_SUBQUERY_OP_NOTIN);
}
ASTNode parent = getParentInWhereClause(node);
if (parent == null) {
root = subQuery;
} else {
int nodeIdx = node.getChildIndex();
parent.setChild(nodeIdx, subQuery);
}
return removeSubQuery(subQuery);
}
return false;
} else if (node == subQuery) {
ASTNode parent = getParentInWhereClause(node);
ASTNode gParent = getParentInWhereClause(parent);
ASTNode sibling = null;
if (parent != null) {
if (subQuery.getChildIndex() == 0) {
sibling = (ASTNode) parent.getChild(1);
} else {
sibling = (ASTNode) parent.getChild(0);
}
}
/*
* SubQuery was only condition in where clause
*/
if (sibling == null) {
root = constructTrueCond();
} // SubQuery was just one conjunct
else if (gParent == null) {
root = sibling;
} else {
// otherwise replace parent by sibling.
int pIdx = parent.getChildIndex();
gParent.setChild(pIdx, sibling);
}
return true;
} else {
return false;
}
}
ASTNode remove() throws SemanticException {
boolean r = removeSubQuery(root);
if (r) {
return root;
}
/*
* Restriction.7.h :: SubQuery predicates can appear only as top level conjuncts.
*/
throw new SemanticException(ErrorMsg.UNSUPPORTED_SUBQUERY_EXPRESSION.getMsg(
subQuery, "Only SubQuery expressions that are top level conjuncts are allowed"));
}
}
static List findSubQueries(ASTNode node)
throws SemanticException {
List subQueries = new ArrayList();
findSubQueries(node, subQueries);
return subQueries;
}
private static void findSubQueries(ASTNode node, List subQueries) {
Deque stack = new ArrayDeque();
stack.push(node);
while (!stack.isEmpty()) {
ASTNode next = stack.pop();
switch(next.getType()) {
case HiveParser.TOK_SUBQUERY_EXPR:
subQueries.add(next);
break;
default:
int childCount = next.getChildCount();
for(int i = childCount - 1; i >= 0; i--) {
stack.push((ASTNode) next.getChild(i));
}
}
}
}
static QBSubQuery buildSubQuery(String outerQueryId,
int sqIdx,
ASTNode sqAST,
ASTNode originalSQAST,
Context ctx) throws SemanticException {
ASTNode sqOp = (ASTNode) sqAST.getChild(0);
ASTNode sq = (ASTNode) sqAST.getChild(1);
ASTNode outerQueryExpr = (ASTNode) sqAST.getChild(2);
/*
* Restriction.8.m :: We allow only 1 SubQuery expression per Query.
*/
if (outerQueryExpr != null && outerQueryExpr.getType() == HiveParser.TOK_SUBQUERY_EXPR ) {
throw new SemanticException(ErrorMsg.UNSUPPORTED_SUBQUERY_EXPRESSION.getMsg(
originalSQAST.getChild(1), "Only 1 SubQuery expression is supported."));
}
return new QBSubQuery(outerQueryId, sqIdx, sq, outerQueryExpr,
buildSQOperator(sqOp),
originalSQAST,
ctx);
}
static SubQueryTypeDef buildSQOperator(ASTNode astSQOp) throws SemanticException {
ASTNode opAST = (ASTNode) astSQOp.getChild(0);
SubQueryType type = SubQueryType.get(opAST);
return new SubQueryTypeDef(opAST, type);
}
/*
* is this expr a UDAF invocation; does it imply windowing
* @return
* 0 if implies neither
* 1 if implies aggregation
* 2 if implies count
* 3 if implies windowing
*/
static int checkAggOrWindowing(ASTNode expressionTree) throws SemanticException {
int exprTokenType = expressionTree.getToken().getType();
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) {
return 3;
}
if (expressionTree.getChild(0).getType() == HiveParser.Identifier) {
String functionName = SemanticAnalyzer.unescapeIdentifier(expressionTree.getChild(0)
.getText());
GenericUDAFResolver udafResolver = FunctionRegistry.getGenericUDAFResolver(functionName);
if (udafResolver != null) {
// we need to know if it is COUNT since this is specialized for IN/NOT IN
// corr subqueries.
if(udafResolver instanceof GenericUDAFCount) {
return 2;
}
return 1;
}
}
}
int r = 0;
for (int i = 0; i < expressionTree.getChildCount(); i++) {
int c = checkAggOrWindowing((ASTNode) expressionTree.getChild(i));
r = Math.max(r, c);
}
return r;
}
static List getTableAliasesInSubQuery(ASTNode fromClause) {
List aliases = new ArrayList();
getTableAliasesInSubQuery((ASTNode) fromClause.getChild(0), aliases);
return aliases;
}
private static void getTableAliasesInSubQuery(ASTNode joinNode, List aliases) {
if ((joinNode.getToken().getType() == HiveParser.TOK_TABREF)
|| (joinNode.getToken().getType() == HiveParser.TOK_SUBQUERY)
|| (joinNode.getToken().getType() == HiveParser.TOK_PTBLFUNCTION)) {
String tableName = SemanticAnalyzer.getUnescapedUnqualifiedTableName((ASTNode) joinNode.getChild(0))
.toLowerCase();
String alias = joinNode.getChildCount() == 1 ? tableName
: SemanticAnalyzer.unescapeIdentifier(joinNode.getChild(joinNode.getChildCount() - 1)
.getText().toLowerCase());
alias = (joinNode.getToken().getType() == HiveParser.TOK_PTBLFUNCTION) ?
SemanticAnalyzer.unescapeIdentifier(joinNode.getChild(1).getText().toLowerCase()) :
alias;
aliases.add(alias);
} else {
ASTNode left = (ASTNode) joinNode.getChild(0);
ASTNode right = (ASTNode) joinNode.getChild(1);
getTableAliasesInSubQuery(left, aliases);
getTableAliasesInSubQuery(right, aliases);
}
}
static ASTNode hasUnQualifiedColumnReferences(ASTNode ast) {
int type = ast.getType();
if ( type == HiveParser.DOT ) {
return null;
}
else if ( type == HiveParser.TOK_TABLE_OR_COL ) {
return ast;
}
for(int i=0; i < ast.getChildCount(); i++ ) {
ASTNode c = hasUnQualifiedColumnReferences((ASTNode) ast.getChild(i));
if ( c != null ) {
return c;
}
}
return null;
}
static ASTNode setQualifiedColumnReferences(ASTNode ast, String tableAlias) {
int type = ast.getType();
if (type == HiveParser.DOT) {
return ast;
}
if (type == HiveParser.TOK_TABLE_OR_COL) {
if (tableAlias == null) {
return null;
}
String colName = SemanticAnalyzer.unescapeIdentifier(ast.getChild(0).getText());
return SubQueryUtils.createColRefAST(tableAlias, colName);
}
for (int i = 0; i < ast.getChildCount(); i++) {
ASTNode child = (ASTNode) ast.getChild(i);
ASTNode c = setQualifiedColumnReferences(child, tableAlias);
if (c == null) {
return null;
}
if (c != child) {
ast.setChild(i, c);
}
}
return ast;
}
static ASTNode subQueryWhere(ASTNode insertClause) {
if (insertClause.getChildCount() > 2 &&
insertClause.getChild(2).getType() == HiveParser.TOK_WHERE ) {
return (ASTNode) insertClause.getChild(2);
}
return null;
}
/*
* construct the ASTNode for the SQ column that will join with the OuterQuery Expression.
* So for 'select ... from R1 where A in (select B from R2...)'
* this will build (= outerQueryExpr 'ast returned by call to buildSQJoinExpr')
*/
static ASTNode buildOuterQryToSQJoinCond(ASTNode outerQueryExpr,
String sqAlias,
RowResolver sqRR) {
ASTNode node = (ASTNode) ParseDriver.adaptor.create(HiveParser.EQUAL, "=");
node.addChild(outerQueryExpr);
node.addChild(buildSQJoinExpr(sqAlias, sqRR));
return node;
}
/*
* construct the ASTNode for the SQ column that will join with the OuterQuery Expression.
* So for 'select ... from R1 where A in (select B from R2...)'
* this will build (. (TOK_TABLE_OR_COL Identifier[SQ_1]) Identifier[B])
* where 'SQ_1' is the alias generated for the SubQuery.
*/
static ASTNode buildSQJoinExpr(String sqAlias, RowResolver sqRR) {
List signature = sqRR.getRowSchema().getSignature();
ColumnInfo joinColumn = signature.get(0);
String[] joinColName = sqRR.reverseLookup(joinColumn.getInternalName());
return createColRefAST(sqAlias, joinColName[1]);
}
static ASTNode buildOuterJoinPostCond(String sqAlias, RowResolver sqRR) {
return isNull(buildSQJoinExpr(sqAlias, sqRR));
}
@SuppressWarnings("rawtypes")
static String getAlias(Operator o, Map aliasToOpInfo) {
for(Map.Entry e : aliasToOpInfo.entrySet()) {
if ( e.getValue() == o) {
return e.getKey();
}
}
return null;
}
static ASTNode createColRefAST(String tabAlias, String colName) {
ASTNode dot = (ASTNode) ParseDriver.adaptor.create(HiveParser.DOT, ".");
ASTNode tabAst = createTabRefAST(tabAlias);
ASTNode colAst = (ASTNode) ParseDriver.adaptor.create(HiveParser.Identifier, colName);
dot.addChild(tabAst);
dot.addChild(colAst);
return dot;
}
static ASTNode createAliasAST(String colName) {
return (ASTNode) ParseDriver.adaptor.create(HiveParser.Identifier, colName);
}
static ASTNode createTabRefAST(String tabAlias) {
ASTNode tabAst = (ASTNode)
ParseDriver.adaptor.create(HiveParser.TOK_TABLE_OR_COL, "TOK_TABLE_OR_COL");
ASTNode tabName = (ASTNode) ParseDriver.adaptor.create(HiveParser.Identifier, tabAlias);
tabAst.addChild(tabName);
return tabAst;
}
static ASTNode buildSelectExpr(ASTNode expression) {
ASTNode selAst = (ASTNode) ParseDriver.adaptor.create(HiveParser.TOK_SELEXPR, "TOK_SELEXPR");
selAst.addChild(expression);
return selAst;
}
static ASTNode buildGroupBy() {
ASTNode gBy = (ASTNode) ParseDriver.adaptor.create(HiveParser.TOK_GROUPBY, "TOK_GROUPBY");
return gBy;
}
static ASTNode createSelectItem(ASTNode expr, ASTNode alias) {
ASTNode selectItem = (ASTNode)
ParseDriver.adaptor.create(HiveParser.TOK_SELEXPR, "TOK_SELEXPR");
selectItem.addChild(expr);
selectItem.addChild(alias);
return selectItem;
}
static ASTNode alterCorrelatedPredicate(ASTNode correlatedExpr, ASTNode sqAlias, boolean left) {
if ( left ) {
correlatedExpr.setChild(0, sqAlias);
} else {
correlatedExpr.setChild(1, sqAlias);
}
return correlatedExpr;
}
static void addGroupExpressionToFront(ASTNode gBy, ASTNode expr) {
ASTNode grpExpr = (ASTNode)
ParseDriver.adaptor.create(HiveParser.TOK_GROUPING_SETS_EXPRESSION,
"TOK_GROUPING_SETS_EXPRESSION");
grpExpr.addChild(expr);
List newChildren = new ArrayList();
newChildren.add(expr);
int i = gBy.getChildCount() - 1;
while ( i >= 0 ) {
newChildren.add((ASTNode) gBy.deleteChild(i));
i--;
}
for(ASTNode child : newChildren ) {
gBy.addChild(child);
}
}
static ASTNode buildPostJoinNullCheck(List subQueryJoinAliasExprs) {
ASTNode check = null;
for(ASTNode expr : subQueryJoinAliasExprs) {
check = orAST(check, isNull(expr));
}
return check;
}
/*
* Set of functions to create the Null Check Query for Not-In SubQuery predicates.
* For a SubQuery predicate like:
* a not in (select b from R2 where R2.y > 5)
* The Not In null check query is:
* (select count(*) as c from R2 where R2.y > 5 and b is null)
* This Subquery is joined with the Outer Query plan on the join condition 'c = 0'.
* The join condition ensures that in case there are null values in the joining column
* the Query returns no rows.
*
* The AST tree for this is:
*
* ^(TOK_QUERY
* ^(TOK FROM
* ^(TOK_SUBQUERY
* {the input SubQuery, with correlation removed}
* subQueryAlias
* )
* )
* ^(TOK_INSERT
* ^(TOK_DESTINATION...)
* ^(TOK_SELECT
* ^(TOK_SELECTEXPR {ast tree for count *}
* )
* ^(TOK_WHERE
* {is null check for joining column}
* )
* )
* )
*/
static ASTNode buildNotInNullCheckQuery(ASTNode subQueryAST,
String subQueryAlias,
String cntAlias,
List corrExprs,
RowResolver sqRR) {
subQueryAST = (ASTNode) ParseDriver.adaptor.dupTree(subQueryAST);
ASTNode qry = (ASTNode)
ParseDriver.adaptor.create(HiveParser.TOK_QUERY, "TOK_QUERY");
qry.addChild(buildNotInNullCheckFrom(subQueryAST, subQueryAlias));
ASTNode insertAST = buildNotInNullCheckInsert();
qry.addChild(insertAST);
insertAST.addChild(buildNotInNullCheckSelect(cntAlias));
insertAST.addChild(buildNotInNullCheckWhere(subQueryAST,
subQueryAlias, corrExprs, sqRR));
return qry;
}
/*
* build:
* ^(TOK FROM
* ^(TOK_SUBQUERY
* {the input SubQuery, with correlation removed}
* subQueryAlias
* )
* )
*/
static ASTNode buildNotInNullCheckFrom(ASTNode subQueryAST, String subQueryAlias) {
ASTNode from = (ASTNode) ParseDriver.adaptor.create(HiveParser.TOK_FROM, "TOK_FROM");
ASTNode sqExpr = (ASTNode)
ParseDriver.adaptor.create(HiveParser.TOK_SUBQUERY, "TOK_SUBQUERY");
sqExpr.addChild(subQueryAST);
sqExpr.addChild(createAliasAST(subQueryAlias));
from.addChild(sqExpr);
return from;
}
/*
* build
* ^(TOK_INSERT
* ^(TOK_DESTINATION...)
* )
*/
static ASTNode buildNotInNullCheckInsert() {
ASTNode insert = (ASTNode)
ParseDriver.adaptor.create(HiveParser.TOK_INSERT, "TOK_INSERT");
ASTNode dest = (ASTNode)
ParseDriver.adaptor.create(HiveParser.TOK_DESTINATION, "TOK_DESTINATION");
ASTNode dir = (ASTNode)
ParseDriver.adaptor.create(HiveParser.TOK_DIR, "TOK_DIR");
ASTNode tfile = (ASTNode)
ParseDriver.adaptor.create(HiveParser.TOK_TMP_FILE, "TOK_TMP_FILE");
insert.addChild(dest);
dest.addChild(dir);
dir.addChild(tfile);
return insert;
}
/*
* build:
* ^(TOK_SELECT
* ^(TOK_SELECTEXPR {ast tree for count *}
* )
*/
static ASTNode buildNotInNullCheckSelect(String cntAlias) {
ASTNode select = (ASTNode)
ParseDriver.adaptor.create(HiveParser.TOK_SELECT, "TOK_SELECT");
ASTNode selectExpr = (ASTNode)
ParseDriver.adaptor.create(HiveParser.TOK_SELEXPR, "TOK_SELEXPR");
ASTNode countStar = (ASTNode)
ParseDriver.adaptor.create(HiveParser.TOK_FUNCTIONSTAR, "TOK_FUNCTIONSTAR");
ASTNode alias = (createAliasAST(cntAlias));
countStar.addChild((ASTNode) ParseDriver.adaptor.create(HiveParser.Identifier, "count"));
select.addChild(selectExpr);
selectExpr.addChild(countStar);
selectExpr.addChild(alias);
return select;
}
/*
* build:
* ^(TOK_WHERE
* {is null check for joining column}
* )
*/
static ASTNode buildNotInNullCheckWhere(ASTNode subQueryAST,
String sqAlias,
List corrExprs,
RowResolver sqRR) {
ASTNode sqSelect = (ASTNode) subQueryAST.getChild(1).getChild(1);
ASTNode selExpr = (ASTNode) sqSelect.getChild(0);
String colAlias = null;
if ( selExpr.getChildCount() == 2 ) {
colAlias = selExpr.getChild(1).getText();
} else if (selExpr.getChild(0).getType() != HiveParser.TOK_ALLCOLREF) {
colAlias = sqAlias + "_ninc_col0";
selExpr.addChild((ASTNode)ParseDriver.adaptor.create(HiveParser.Identifier, colAlias));
} else {
List signature = sqRR.getRowSchema().getSignature();
ColumnInfo joinColumn = signature.get(0);
String[] joinColName = sqRR.reverseLookup(joinColumn.getInternalName());
colAlias = joinColName[1];
}
ASTNode searchCond = isNull(createColRefAST(sqAlias, colAlias));
for(ASTNode e : corrExprs ) {
ASTNode p = (ASTNode) ParseDriver.adaptor.dupTree(e);
p = isNull(p);
searchCond = orAST(searchCond, p);
}
ASTNode where = (ASTNode) ParseDriver.adaptor.create(HiveParser.TOK_WHERE, "TOK_WHERE");
where.addChild(searchCond);
return where;
}
static ASTNode buildNotInNullJoinCond(String subqueryAlias, String cntAlias) {
ASTNode eq = (ASTNode)
ParseDriver.adaptor.create(HiveParser.EQUAL, "=");
eq.addChild(createColRefAST(subqueryAlias, cntAlias));
eq.addChild((ASTNode)
ParseDriver.adaptor.create(HiveParser.Number, "0"));
return eq;
}
public static interface ISubQueryJoinInfo {
public String getAlias();
public JoinType getJoinType();
public ASTNode getJoinConditionAST();
public QBSubQuery getSubQuery();
public ASTNode getSubQueryAST();
public String getOuterQueryId();
};
/*
* Using CommonTreeAdaptor because the Adaptor in ParseDriver doesn't carry
* the token indexes when duplicating a Tree.
*/
static final CommonTreeAdaptor adaptor = new CommonTreeAdaptor();
}
