Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/9055#discussion_r42586670
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/joinTypes.scala
---
@@ -47,4 +48,9 @@ case object RightOuter extends JoinType
case object FullOuter extends JoinType
-case object LeftSemi extends JoinType
+abstract class LeftSemiJoin extends JoinType
--- End diff --
Making a common abstract parent class for `LeftSemiJoin` and `LeftAntiJoin`
will reduce the code change in `Optimizer` and `Strategies`, but you're right,
I didn't give it a proper name to reflect the concept, not sure if you have
better idea.
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