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https://issues.apache.org/jira/browse/ARROW-10304?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antoine Pitrou resolved ARROW-10304.
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Resolution: Fixed
Issue resolved by pull request 8466
[https://github.com/apache/arrow/pull/8466]
> [C++][Compute] Optimize variance kernel for integers
> ----------------------------------------------------
>
> Key: ARROW-10304
> URL: https://issues.apache.org/jira/browse/ARROW-10304
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Yibo Cai
> Assignee: Yibo Cai
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.0.0
>
> Time Spent: 3h
> Remaining Estimate: 0h
>
> Current variance kernel converts all data type to `double` before
> calculation. It's sub-optimal for integers. Integer arithmetic is much faster
> than floating points, e.g., summation is 4x faster [1].
> A quick test for calculating int32 variance shows up to 3x performance gain.
> Another benefit is that integer arithmetic is accurate.
> [1] https://quick-bench.com/q/_Sz-Peq1MNWYwZYrTtQDx3GI7lQ
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