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https://issues.apache.org/jira/browse/SPARK-39475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17554359#comment-17554359
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Apache Spark commented on SPARK-39475:
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User 'ulysses-you' has created a pull request for this issue:
https://github.com/apache/spark/pull/36874
> Pull out complex join keys for shuffled join
> --------------------------------------------
>
> Key: SPARK-39475
> URL: https://issues.apache.org/jira/browse/SPARK-39475
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: XiDuo You
> Priority: Major
>
> For a sort merge join, a complex join key may run three times at most:
> # exchange
> # sort
> # join
> We can pull out it to project so we will execute it only once.
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