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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/05/06 16:02:30 UTC

[GitHub] [arrow-datafusion] Dandandan opened a new issue #277: Add optimization to remove unnecessary projections

Dandandan opened a new issue #277:
URL: https://github.com/apache/arrow-datafusion/issues/277


   **Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
   Projections might be removed from a logical plan if they don't change the underlying plan.
   
   **Describe the solution you'd like**
   An optimization rule that removes any.
   The most simple/basic way would be to only remove projections that refer to fields in the same order as the underlying plan.
   A more complete optimization could also reorder underlying projections / table scans in order to remove projections. Also, expressions could be equivalent to those somewhere else in a plan, which could be considered.
   
   **Describe alternatives you've considered**
   
   
   **Additional context**
   
   


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[GitHub] [arrow-datafusion] Dandandan closed issue #277: Add optimization to remove unnecessary projections

Posted by GitBox <gi...@apache.org>.
Dandandan closed issue #277:
URL: https://github.com/apache/arrow-datafusion/issues/277


   


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[GitHub] [arrow-datafusion] Dandandan commented on issue #277: Add optimization to remove unnecessary projections

Posted by GitBox <gi...@apache.org>.
Dandandan commented on issue #277:
URL: https://github.com/apache/arrow-datafusion/issues/277#issuecomment-888031571


   Thanks @waynexia 


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[GitHub] [arrow-datafusion] waynexia commented on issue #277: Add optimization to remove unnecessary projections

Posted by GitBox <gi...@apache.org>.
waynexia commented on issue #277:
URL: https://github.com/apache/arrow-datafusion/issues/277#issuecomment-888028170


   Hi @Dandandan, it seems to be my problem to not link this issue with corresponding PR. I think we can close it now?


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