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https://issues.apache.org/jira/browse/SPARK-32765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17188709#comment-17188709
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Apache Spark commented on SPARK-32765:
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User 'leanken' has created a pull request for this issue:
https://github.com/apache/spark/pull/29614
> EliminateJoinToEmptyRelation should respect exchange behavior when
> canChangeNumPartitions == false
> --------------------------------------------------------------------------------------------------
>
> Key: SPARK-32765
> URL: https://issues.apache.org/jira/browse/SPARK-32765
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Leanken.Lin
> Priority: Major
>
> Currently, EliminateJoinToEmptyRelation Rule will convert Join into
> EmptyRelation in some cases with AQE on. But if either sub plan of Join
> contains a ShuffleQueryStage(canChangeNumPartitions == false), which means
> the Exchange produced by repartition Or singlePartition, in this case, if we
> were to convert it into an EmptyRelation, it will lost user specified number
> partition information for downstream operator, it's not right.
> So in the Patch, try not to do the conversion if either sub plan of Join
> contains ShuffleQueryStage(canChangeNumPartitions == false)
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