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https://issues.apache.org/jira/browse/ARROW-18098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17624289#comment-17624289
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Joris Van den Bossche commented on ARROW-18098:
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It seems that numpy also first calculates the uniques before sorting.
> [C++] Vector kernel for "intersecting" two arrays (all common elements)
> -----------------------------------------------------------------------
>
> Key: ARROW-18098
> URL: https://issues.apache.org/jira/browse/ARROW-18098
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Joris Van den Bossche
> Assignee: Will Ayd
> Priority: Major
> Labels: compute, kernel
>
> This would be similar to numpy's {{intersect1d}}
> (https://numpy.org/doc/stable/reference/generated/numpy.intersect1d.html)
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