Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/9055#discussion_r42620776
--- 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 --
Well, actually in https://en.wikipedia.org/wiki/Relational_algebra,
`anti-join` also sometimes call `anti-semijoin`, that's the original idea why I
make the LeftSemiJoin as an abstract class with 2 objects `LeftSemi` &
`LeftAnti`.
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