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https://issues.apache.org/jira/browse/ARROW-553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15863332#comment-15863332
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Uwe L. Korn commented on ARROW-553:
-----------------------------------
PR: https://github.com/apache/arrow/pull/338
> C++: Faster valid bitmap building
> ---------------------------------
>
> Key: ARROW-553
> URL: https://issues.apache.org/jira/browse/ARROW-553
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Uwe L. Korn
> Assignee: Uwe L. Korn
>
> Currently we build up the bitmaps bit-by-bit which takes very long. Instead
> we can build them byte-by-byte in the general case and use {{memset}} for the
> non-null case.
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