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https://issues.apache.org/jira/browse/ARROW-13969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexander updated ARROW-13969:
------------------------------
Description:
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
was:
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.
> [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
> Priority: Major
> Labels: analytics, kernel, query-engine
> Fix For: 6.0.0
>
>
> 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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