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Posted to issues@arrow.apache.org by "Antoine Pitrou (JIRA)" <ji...@apache.org> on 2019/02/06 14:56:00 UTC

[jira] [Commented] (ARROW-3055) [C++] Use byte pop counts to bypass bit checking in some cases in BitmapReader classes

    [ https://issues.apache.org/jira/browse/ARROW-3055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16761806#comment-16761806 ] 

Antoine Pitrou commented on ARROW-3055:
---------------------------------------

If there is a particular workload we want to optimize, I think experimenting with an unrolled version of `ArrayDataVisitor` might be a more promising track.

> [C++] Use byte pop counts to bypass bit checking in some cases in BitmapReader classes
> --------------------------------------------------------------------------------------
>
>                 Key: ARROW-3055
>                 URL: https://issues.apache.org/jira/browse/ARROW-3055
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Wes McKinney
>            Priority: Major
>
> When performing a scan of a bitmap, skipping bit checking math could improve performance, but we would need to investigate



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