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

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

    [ https://issues.apache.org/jira/browse/ARROW-13769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17405365#comment-17405365 ] 

Antoine Pitrou commented on ARROW-13769:
----------------------------------------

cc [~lidavidm]

> [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
>            Priority: Minor
>
> 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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