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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2020/06/09 16:48:54 UTC

[GitHub] [spark] cloud-fan commented on pull request #28745: [SPARK-31915][SQL][PYTHON] Remove projection that adds grouping keys in grouped and cogrouped pandas UDFs

cloud-fan commented on pull request #28745:
URL: https://github.com/apache/spark/pull/28745#issuecomment-641432882


   will this cause perf regression? e.g. if grouping expr is expensive, with the Project we only need to evaluate it once.


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