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https://issues.apache.org/jira/browse/ARROW-7587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17343442#comment-17343442
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Antoine Pitrou commented on ARROW-7587:
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[~icook] it's called "partition_nth_indices":
https://arrow.apache.org/docs/cpp/compute.html#sorts-and-partitions
> [C++][Compute] Add Top-k kernel
> -------------------------------
>
> Key: ARROW-7587
> URL: https://issues.apache.org/jira/browse/ARROW-7587
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Yibo Cai
> Assignee: Yibo Cai
> Priority: Minor
> Labels: pull-request-available
> Fix For: 0.17.0
>
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> Add a kernel to get top k smallest or largest elements (indices). If we don't
> require these elements to be sorted, std::nth_element will be a much faster
> solution than sorting everything then pick top k.
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