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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2021/05/18 00:28:48 UTC

[GitHub] [spark] Kimahriman commented on pull request #32559: [SPARK-35410][SQL] SubExpr elimination should not include redundant children exprs in conditional expression

Kimahriman commented on pull request #32559:
URL: https://github.com/apache/spark/pull/32559#issuecomment-842732261


   It is a bit of a performance regression in certain cases so that seems like a bug. We have heavily chained expressions in when clauses and I suspect (but haven't been able to prove yet because of the complexity) it's causing us some issues.


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