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Posted to issues-all@impala.apache.org by "Csaba Ringhofer (Jira)" <ji...@apache.org> on 2021/10/11 09:37:00 UTC

[jira] [Assigned] (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 ]

Csaba Ringhofer reassigned IMPALA-10961:
----------------------------------------

    Assignee: Noemi Pap-Takacs

> 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
>
> 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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