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Posted to issues@impala.apache.org by "Noemi Pap-Takacs (Jira)" <ji...@apache.org> on 2022/04/26 09:15:00 UTC

[jira] [Resolved] (IMPALA-10961) Implement 3-way quicksort in sorter

     [ https://issues.apache.org/jira/browse/IMPALA-10961?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Noemi Pap-Takacs resolved IMPALA-10961.
---------------------------------------
    Fix Version/s: Impala 4.1.0
       Resolution: Fixed

> Implement 3-way quicksort in sorter
> -----------------------------------
>
>                 Key: IMPALA-10961
>                 URL: https://issues.apache.org/jira/browse/IMPALA-10961
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Backend
>            Reporter: Csaba Ringhofer
>            Assignee: Noemi Pap-Takacs
>            Priority: Major
>              Labels: performance
>             Fix For: Impala 4.1.0
>
>         Attachments: checksorted.patch, qsort.cc
>
>
> Using 3-way partitioning in quicksort could massively speed up sorting if there is a large number of duplicate elements. This is very common in sorts before partitioned inserts.



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