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https://issues.apache.org/jira/browse/IMPALA-10961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17519010#comment-17519010
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ASF subversion and git services commented on IMPALA-10961:
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Commit 7b235eebd5dda9074e2b7724e6b290f49c1bb8ce in impala's branch
refs/heads/master from Joe McDonnell
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=7b235eebd ]
IMPALA-11230: Add test for crash in partitioned Top-N codegen code
User workloads hit a crash for certain queries that
use partitioned Top-N operators. The crash occurred
only when codegen is enabled. After investigation,
the crash was due to a nullptr being passed into
TupleRowComparator::Compare(). The issue was fixed
as part of IMPALA-10961.
This adds a test case with a SQL statement that
triggers a crash if IMPALA-10961 is not present.
Change-Id: I6909ef660b01ad3d301273deb8a8c31120445f79
Reviewed-on: http://gerrit.cloudera.org:8080/18389
Reviewed-by: Aman Sinha <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
> 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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