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Posted to issues@arrow.apache.org by "Wes McKinney (Jira)" <ji...@apache.org> on 2020/05/25 14:07:00 UTC

[jira] [Commented] (ARROW-1565) [C++] Implement TopK/BottomK streaming execution nodes

    [ https://issues.apache.org/jira/browse/ARROW-1565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17116048#comment-17116048 ] 

Wes McKinney commented on ARROW-1565:
-------------------------------------

I reframed this issue as a query processing task. We need to be able to compute TopK/BottomK with chunked data

> [C++] Implement TopK/BottomK streaming execution nodes
> ------------------------------------------------------
>
>                 Key: ARROW-1565
>                 URL: https://issues.apache.org/jira/browse/ARROW-1565
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++
>            Reporter: Wes McKinney
>            Priority: Major
>              Labels: Analytics
>             Fix For: 2.0.0
>
>
> Heap-based topk can compute these indices in O(n log k) time



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