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Posted to issues@arrow.apache.org by "Antoine Pitrou (Jira)" <ji...@apache.org> on 2021/08/26 16:59:00 UTC

[jira] [Created] (ARROW-13769) [C++] BitmapAnd, BitmapOr... could return the number of set bits

Antoine Pitrou created ARROW-13769:
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             Summary: [C++] BitmapAnd, BitmapOr... could return the number of set bits
                 Key: ARROW-13769
                 URL: https://issues.apache.org/jira/browse/ARROW-13769
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Antoine Pitrou


When updating a validity bitmap using a bitwise operation such as AND or OR, it can be useful to also know the new validity count. It is probably costless to compute the new popcount inside BitmapAnd and friends. Micro-benchmarks will have to be run to validate that assumption.



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