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https://issues.apache.org/jira/browse/ARROW-12615?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17405311#comment-17405311
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David Li commented on ARROW-12615:
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This was duplicated by ARROW-13691 which has a PR up (and takes the approach 
suggested by Antoine).

> [C++] Add options for handling NAs to stddev and variance
> ---------------------------------------------------------
>
>                 Key: ARROW-12615
>                 URL: https://issues.apache.org/jira/browse/ARROW-12615
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Nic Crane
>            Priority: Major
>
> Currently the compute kernels `stddev `and `variance` automatically ignore 
> NAs, but it would be useful if there was an option to toggle this behaviour



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