leanken commented on pull request #29389:
URL: https://github.com/apache/spark/pull/29389#issuecomment-671433050
@cloud-fan updated. refine prepareRelation to return
```
private[joins] case class HashedRelationInfo(
relationTerm: String,
keyIsUnique: Boolean,
isEmptyHashedRelation: Boolean)
```
Code change int BHJ reverted, and do fast stop in HashJoin.scala codegenAnti
using isEmptyHashedRelation
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