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Posted to issues@spark.apache.org by "Eugene Koifman (Jira)" <ji...@apache.org> on 2021/12/27 17:26:00 UTC

[jira] [Created] (SPARK-37753) DynamicJoinSelection.shouldDemoteBroadcastHashJoin should apply to left outer with join many empty partitions on the left

Eugene Koifman created SPARK-37753:
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             Summary: 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


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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