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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/04/26 13:19:12 UTC

[GitHub] [arrow-datafusion] alamb commented on issue #98: [Rust] Add constant folding to expressions during logically planning

alamb commented on issue #98:
URL: https://github.com/apache/arrow-datafusion/issues/98#issuecomment-826828967


   Comment from Jorge Leitão(jorgecarleitao) @ 2020-08-23T21:51:08.856+0000:
   <pre>That is a cool idea. It seems to be a case of algebraic simplification. Maybe there is already a rust library that can do that work for us?</pre>
   
   Comment from Remi Dettai(rdettai) @ 2020-12-08T14:11:11.412+0000:
   <pre>This could also be used to apply filter pushdown into the catalog, if the combination (and) of:
    - the file/partition statistics ({{col( x ) > min and col( x ) < max}})
    - the filter expression
   
   can be simplified to {{false}}, their is no need to read that file/partition. Isn't that wonderful ? :)
   
   Note: there is an implementation of this folding for the C++ dataset API: [https://github.com/apache/arrow/blob/master/cpp/src/arrow/dataset/filter.h]</pre>
   
   Comment from Andrew Lamb(alamb) @ 2021-04-26T12:33:27.229+0000:
   <pre>Migrated to github: https://github.com/apache/arrow-rs/issues/96</pre>


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