org.apache.hadoop.hive.ql.optimizer.calcite.translator.JoinTypeCheckCtx Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
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package org.apache.hadoop.hive.ql.optimizer.calcite.translator;
import java.util.List;
import org.apache.hadoop.hive.ql.parse.JoinType;
import org.apache.hadoop.hive.ql.parse.RowResolver;
import org.apache.hadoop.hive.ql.parse.SemanticException;
import org.apache.hadoop.hive.ql.parse.TypeCheckCtx;
import com.google.common.collect.ImmutableList;
/**
* JoinTypeCheckCtx is used by Calcite planner(CBO) to generate Join Conditions from Join Condition AST.
* Reasons for sub class:
* 1. Join Conditions can not handle:
* a. Stateful Functions
* b. Distinct
* c. '*' expr
* d. '.*' expr
* e. Windowing expr
* f. Complex type member access
* g. Array Index Access
* h. Sub query
* i. GB expr elimination
* 2. Join Condn expr has two input RR as opposed to one.
*/
/**
* TODO:
* 1. Could we use combined RR instead of list of RR ?
* 2. Why not use GB expr ?
*/
public class JoinTypeCheckCtx extends TypeCheckCtx {
private final ImmutableList inputRRLst;
private final boolean outerJoin;
public JoinTypeCheckCtx(RowResolver leftRR, RowResolver rightRR, JoinType hiveJoinType)
throws SemanticException {
super(RowResolver.getCombinedRR(leftRR, rightRR), false, false, false, false, false, false,
false, false);
this.inputRRLst = ImmutableList.of(leftRR, rightRR);
this.outerJoin = (hiveJoinType == JoinType.LEFTOUTER) || (hiveJoinType == JoinType.RIGHTOUTER)
|| (hiveJoinType == JoinType.FULLOUTER);
}
/**
* @return the inputRR List
*/
public List getInputRRList() {
return inputRRLst;
}
public boolean isOuterJoin() {
return outerJoin;
}
}