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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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