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https://issues.apache.org/jira/browse/ARROW-13769?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pradeep Garigipati resolved ARROW-13769.
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Resolution: Won't Do
In light of discussion comments based on benchmark results posted on the GitHub
PR [https://github.com/apache/arrow/pull/11674] , it has been decided that
calculating pop count on the output isn't beneficial as originally anticipated
it to be. Please go through the PR comments for a detailed information and the
benchmark results. Marking this issue as resolved.
> [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: 9.5h
> 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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