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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2022/09/15 15:25:40 UTC

[GitHub] [spark] ekoifman commented on pull request #34464: [SPARK-37193][SQL] DynamicJoinSelection.shouldDemoteBroadcastHashJoin should not apply to outer joins

ekoifman commented on PR #34464:
URL: https://github.com/apache/spark/pull/34464#issuecomment-1248258964

   @thomasg19930417 
   Imagine you have an inner join where the one side has 0 rows.  As soon as you know that one side is empty, you don't have evaluate any operators on the other side (or stop executing them if they started already) since you know the join won't produce any rows.
   


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