maropu commented on a change in pull request #29104:
URL: https://github.com/apache/spark/pull/29104#discussion_r457092224
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/planning/patterns.scala
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@@ -388,3 +390,36 @@ object PhysicalWindow {
case _ => None
}
}
+
+object ExtractSingleColumnNotInSubquery extends JoinSelectionHelper {
Review comment:
This optimization is related only to sub-queries? Actually, this PR
targets at null-aware anti-join with a single-column case? e.g., `select * from
t1 anti join t2 on t1.id = t2.id or isnull(t1.id = t2.id)`
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