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https://issues.apache.org/jira/browse/SPARK-37753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17500446#comment-17500446
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Apache Spark commented on SPARK-37753:
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User 'ekoifman' has created a pull request for this issue:
https://github.com/apache/spark/pull/35715
> DynamicJoinSelection.shouldDemoteBroadcastHashJoin should apply to left outer
> with join many empty partitions on the left
> -------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-37753
> URL: https://issues.apache.org/jira/browse/SPARK-37753
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.8
> Reporter: Eugene Koifman
> Priority: Major
>
> if {{DynamicJoinSelection}} sees a LOJ where there are many empty partitions
> on the left, we want to run it as a shuffle join so that tasks with empty LHS
> short circuit quickly.
> So we should inhibit Broadcast join.
> This is a follow up to SPARK-37193
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