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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/05/06 20:12:36 UTC

[GitHub] [arrow-datafusion] jorgecarleitao commented on issue #237: Extend & generalize constant folding / evaluation in logical optimizer

jorgecarleitao commented on issue #237:
URL: https://github.com/apache/arrow-datafusion/issues/237#issuecomment-833828498


   fwiw, when a logical optimization is applied, the expressions are re-written and the "column name" is consequently re-written. Thus, what was named `LIMIT (0 + 0)` becomes `LIMIT 0`.
   
   To apply it on the logical level, we may need to wrap the expression by an `.alias` for it to preserve the column name.
   
   I agree that the sooner in the optimization these are applied, the higher the likelihood of synergies between optimizers.
   


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