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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2020/10/08 06:20:24 UTC

[GitHub] [spark] cloud-fan edited a comment on pull request #29975: [SPARK-33092][SQL] Support subexpression elimination in ProjectExec

cloud-fan edited a comment on pull request #29975:
URL: https://github.com/apache/spark/pull/29975#issuecomment-705356435


   sorry for my bad memory, is it an existing issue that subexpression elimination can cause perf regression because of the eager execution? e.g. an expression is inside a condition branch (e.g. CASE WHEN) and may not be evaluated.
   
   cc @rednaxelafx 


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