Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/23211#discussion_r240097479
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -984,6 +1002,28 @@ object PushDownPredicate extends Rule[LogicalPlan]
with PredicateHelper {
project.copy(child = Filter(replaceAlias(condition, aliasMap),
grandChild))
+ // Similar to the above Filter over Project
+ // LeftSemi/LeftAnti over Project
+ case join @ Join(p @ Project(pList, grandChild), rightOp,
LeftSemiOrAnti(joinType), joinCond)
--- End diff --
Shall we create a new rule `PushdownLeftSemaOrAntiJoin`?
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