cloud-fan commented on a change in pull request #23057: [SPARK-26078][SQL]
Dedup self-join attributes on IN subqueries
URL: https://github.com/apache/spark/pull/23057#discussion_r240465020
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/subquery.scala
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@@ -92,18 +114,20 @@ object RewritePredicateSubquery extends Rule[LogicalPlan]
with PredicateHelper {
// Deduplicate conflicting attributes if any.
dedupJoin(Join(outerPlan, sub, LeftAnti, joinCond))
case (p, InSubquery(values, ListQuery(sub, conditions, _, _))) =>
- val inConditions = values.zip(sub.output).map(EqualTo.tupled)
+ val newSub = dedupSubqueryOnSelfJoin(values, sub)
+ val inConditions = values.zip(newSub.output).map(EqualTo.tupled)
val (joinCond, outerPlan) = rewriteExistentialExpr(inConditions ++
conditions, p)
// Deduplicate conflicting attributes if any.
- dedupJoin(Join(outerPlan, sub, LeftSemi, joinCond))
+ dedupJoin(Join(outerPlan, newSub, LeftSemi, joinCond))
Review comment:
do we still need to dedup here?
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