leanken commented on pull request #29104:
URL: https://github.com/apache/spark/pull/29104#issuecomment-661663720
> canEvaluate
```
join.scala has restricted rules about left anti join build side
def canBuildLeft(joinType: JoinType): Boolean = {
joinType match {
case _: InnerLike | RightOuter => true
case _ => false
}
}
def canBuildRight(joinType: JoinType): Boolean = {
joinType match {
case _: InnerLike | LeftOuter | LeftSemi | LeftAnti | _: ExistenceJoin
=> true
case _ => false
}
}
```
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