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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/05/26 06:38:25 UTC

[GitHub] [arrow-rs] ritchie46 edited a comment on pull request #341: Fix filter UB and add fast path

ritchie46 edited a comment on pull request #341:
URL: https://github.com/apache/arrow-rs/pull/341#issuecomment-848506037


   > I mean that we no longer need to try to prune expressions of the form 1 == 1: they automatically get converted to trues, which amounts to a O(1) evaluation in the filter. (We may still do it to make the plan cleaner)
   
   This was the same reason for met doing the PR.
   
   I paid a relatively heavy price for filtering null values on a `DataFrame` that did not have any nulls (so all filter values were `true`). 


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