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https://issues.apache.org/jira/browse/ARROW-1559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16220896#comment-16220896
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Wes McKinney commented on ARROW-1559:
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All hash table related functions will need an option to address how nulls are
handled. For example, null could be included or excluded from the unique values
depending on the needs of the application (sometimes null is data, other times
it is to be ignored).
> [C++] Kernel implementations for "unique" (compute distinct elements of array)
> ------------------------------------------------------------------------------
>
> Key: ARROW-1559
> URL: https://issues.apache.org/jira/browse/ARROW-1559
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Labels: Analytics
> Fix For: 0.8.0
>
>
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