[jira] [Commented] (ARROW-7587) [C++][Compute] Add Top-k kernel

["Ian Cook (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-7587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17343435#comment-17343435 ] 

Ian Cook commented on ARROW-7587:
---------------------------------

[~yibo] it looks like this kernel is not registered in the function registry and is not listed in the compute functions docs page. Is it intended for internal use only?

> [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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