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https://issues.apache.org/jira/browse/SPARK-34014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17259080#comment-17259080
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Apache Spark commented on SPARK-34014:
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User 'tanelk' has created a pull request for this issue:
https://github.com/apache/spark/pull/31045
> Ignore Distinct if it is the right child of a left semi or anti join
> --------------------------------------------------------------------
>
> Key: SPARK-34014
> URL: https://issues.apache.org/jira/browse/SPARK-34014
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Tanel Kiis
> Priority: Major
>
> Left semi and anti joins ignore duplicates in the right child. Finding
> distinct values there will only add overhead.
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