Github user nsyca commented on a diff in the pull request:
https://github.com/apache/spark/pull/17520#discussion_r109522412
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -1032,6 +1248,109 @@ object PushPredicateThroughJoin extends
Rule[LogicalPlan] with PredicateHelper {
}
/**
+ * Pushes down a subquery, in the form of [[Join LeftSemi/LeftAnti]]
operator
+ * to the left or right side of a join below.
+ */
+object PushLeftSemiLeftAntiThroughJoin extends Rule[LogicalPlan] with
PredicateHelper {
--- End diff --
Pushing down LeftSemi/LeftAnti through a join is better done as part of the
cost-based join reordering. This code is put here to preserve the existing
behaviour.
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