yaooqinn commented on pull request #31199:
URL: https://github.com/apache/spark/pull/31199#issuecomment-762638710


   +1 for @cloud-fan 's decision. As far as I'm concerned, query 41 from TPCDS 
is a quite normal case, 3.1 generates oversized codegen classes that let it 
fall back to the non-codegen mode and cause huge performance regession.  Users 
can hit this regularly in real-world cases if they work on their pre-defined 
tables with char/varchar


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