maropu commented on a change in pull request #23750: [SPARK-19712][SQL] Pushing
Left Semi and Left Anti joins through Project, Aggregate, Window, Union etc.
URL: https://github.com/apache/spark/pull/23750#discussion_r256821230
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -1188,6 +1189,190 @@ object PushDownPredicate extends Rule[LogicalPlan]
with PredicateHelper {
}
}
+object PushDownLeftSemiAntiJoin extends Rule[LogicalPlan] with PredicateHelper
{
+ def apply(plan: LogicalPlan): LogicalPlan = plan transform {
+ // Similar to the above Filter over Project
+ // LeftSemi/LeftAnti over Project
+ case join @ Join(p @ Project(pList, gChild), rightOp,
LeftSemiOrAnti(joinType), joinCond, hint)
+ if pList.forall(_.deterministic) &&
!ScalarSubquery.hasScalarSubquery(pList) &&
+ canPushThroughCondition(Seq(gChild), joinCond, rightOp) =>
+ if (joinCond.isEmpty) {
+ // No join condition, just push down the Join below Project
+ Project(pList, Join(gChild, rightOp, joinType, joinCond, hint))
Review comment:
`p.copy(child = ...)`?
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