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https://issues.apache.org/jira/browse/SPARK-36794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17427356#comment-17427356
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Apache Spark commented on SPARK-36794:
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User 'c21' has created a pull request for this issue:
https://github.com/apache/spark/pull/34247

> Ignore duplicated join keys when building relation for SEMI/ANTI hash join
> --------------------------------------------------------------------------
>
>                 Key: SPARK-36794
>                 URL: https://issues.apache.org/jira/browse/SPARK-36794
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 3.3.0
>            Reporter: Cheng Su
>            Assignee: Cheng Su
>            Priority: Minor
>             Fix For: 3.3.0
>
>
> For LEFT SEMI and LEFT ANTI hash equi-join without extra join condition, we 
> only need to keep one row per unique join key(s) inside hash table 
> (`HashedRelation`) when building the hash table. This can help reduce the 
> size of hash table of join.



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