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https://issues.apache.org/jira/browse/IMPALA-10961?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kurt Deschler updated IMPALA-10961:
-----------------------------------
Attachment: checksorted.patch
qsort.cc
> 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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