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https://issues.apache.org/jira/browse/SPARK-32573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-32573.
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Fix Version/s: 3.1.0
Resolution: Fixed
Issue resolved by pull request 29389
[https://github.com/apache/spark/pull/29389]
> Anti Join Improvement with EmptyHashedRelation and
> EmptyHashedRelationWithAllNullKeys
> -------------------------------------------------------------------------------------
>
> Key: SPARK-32573
> URL: https://issues.apache.org/jira/browse/SPARK-32573
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Leanken.Lin
> Assignee: Leanken.Lin
> Priority: Minor
> Fix For: 3.1.0
>
>
> In SPARK-32290, we introduced several new types of HashedRelation
> * EmptyHashedRelation
> * EmptyHashedRelationWithAllNullKeys
> They were all limited to used only in NAAJ scenario. These new HashedRelation
> could be applied to other scenario for performance improvements.
> * EmptyHashedRelation could also be used in Normal AntiJoin for fast stop
> * While AQE is on and buildSide is EmptyHashedRelationWithAllNullKeys, can
> convert NAAJ to a Empty LocalRelation to skip meaningless data iteration
> since in Single-Key NAAJ, if null key exists in BuildSide, will drop all
> records in streamedSide.
> This Patch including two changes.
> * using EmptyHashedRelation to do fast stop for common anti join as well
> * In AQE, eliminate BroadcastHashJoin(NAAJ) if buildSide is a
> EmptyHashedRelationWithAllNullKeys
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