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Posted to issues-all@impala.apache.org by "Noemi Pap-Takacs (Jira)" <ji...@apache.org> on 2021/10/27 08:06:00 UTC
[jira] [Work started] (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 ]
Work on IMPALA-10961 started by Noemi Pap-Takacs.
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> 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
> 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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