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https://issues.apache.org/jira/browse/ARROW-13769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17442365#comment-17442365
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Antoine Pitrou commented on ARROW-13769:
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[~pradeepgarigipati] I would favor 1) and 3). Hopefully we can make it so that
performance doesn't suffer.
> [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
> Assignee: Pradeep Garigipati
> Priority: Minor
> Labels: good-first-issue, pull-request-available
> Time Spent: 20m
> Remaining Estimate: 0h
>
> 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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