cloud-fan commented on pull request #31024:
URL: https://github.com/apache/spark/pull/31024#issuecomment-757679807


   > Move UDF, LikeAny, LikeAll and CaseWhen to the end because these 
Expressions always CPU intensive.
   
   I'm not sure about it. CaseWhen can be fast if it has only one branch. 
Probably we should only do this for CBO.


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