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https://issues.apache.org/jira/browse/ARROW-8537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17088338#comment-17088338
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Yibo Cai commented on ARROW-8537:
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Add analysis: https://github.com/apache/arrow/pull/6986#issuecomment-616978252
> [C++] Performance regression from ARROW-8523
> --------------------------------------------
>
> Key: ARROW-8537
> URL: https://issues.apache.org/jira/browse/ARROW-8537
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Yibo Cai
> Priority: Major
>
> I optimized BitmapReader in [this
> PR|https://github.com/apache/arrow/pull/6986] and see performance uplift of
> BitmapReader test case. I didn't check other test cases as this change looks
> trivial.
> I reviewed all test cases just now and see big performance drop of 4 cases,
> details at [PR
> link|https://github.com/apache/arrow/pull/6986#issuecomment-616915079].
> I also compared performance of code using BitmapReader, no obvious changes
> found. Looks we should revert that PR.
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