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Posted to jira@arrow.apache.org by "Antoine Pitrou (Jira)" <ji...@apache.org> on 2021/12/13 17:49:00 UTC

[jira] [Updated] (ARROW-13969) [C++][Compute] Implement SelectKStable

     [ https://issues.apache.org/jira/browse/ARROW-13969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Antoine Pitrou updated ARROW-13969:
-----------------------------------
    Fix Version/s: 8.0.0
                       (was: 7.0.0)

> [C++][Compute] Implement SelectKStable
> --------------------------------------
>
>                 Key: ARROW-13969
>                 URL: https://issues.apache.org/jira/browse/ARROW-13969
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Alexander Ocsa
>            Priority: Major
>              Labels: analytics, kernel, query-engine
>             Fix For: 8.0.0
>
>
> PR [https://github.com/apache/arrow/pull/11019] implements SelectKUnstable.
>  
> Some previous result of SelectKUnstable using StableHeap is shown here: [https://github.com/apache/arrow/pull/11019#issuecomment-913977337] 
>  
> So, implementation of SelectKStable   should explore how to implement this algorithm using StablePartition + stable_sorting.
>  
> Final note: As mentioned here: [https://github.com/apache/arrow/pull/11019#discussion_r706231044] 
> .e. instead of {{select_k_options.is_top_k()}} have 1) a check that there are sort keys and then 2) check {{select_k_options.sort_keys[0].order == Descending}} instead, inside the function definition.
> !https://github.githubassets.com/images/icons/emoji/unicode/1f44d.png|width=20,height=20! 1
>  



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