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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2021/10/12 02:32:20 UTC

[GitHub] [flink] zicat commented on pull request #17449: [FLINK-24504][table-planner] Flink common expression elimination

zicat commented on pull request #17449:
URL: https://github.com/apache/flink/pull/17449#issuecomment-940602034


   > A simple map with the code as key doesn't seem sufficient to me. What if the function is non-deterministic? What if it is called with arguments which are calls to non-deterministic functions?
   > 
   > I think in general this should be handled in the optimizer, not the code generation.
   
   Thank you very much for your quick reply, I will try to research whether can optimize the RexNode to eliminate common expression. 


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