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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2021/02/04 16:40:33 UTC

[GitHub] [spark] maryannxue commented on pull request #30829: [SPARK-33832][SQL] Add an option in AQE to mitigate skew even if it c…

maryannxue commented on pull request #30829:
URL: https://github.com/apache/spark/pull/30829#issuecomment-773444471


   @ekoifman This check is to guard against re-planning that turns an already shuffle-materialized SMJ to BHJ while causing extra shuffles downstream.
   
   One way around this might be to cost a skew join differently so it counters the increased cost of the extra shuffle.


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