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https://issues.apache.org/jira/browse/IMPALA-10961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17496628#comment-17496628
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ASF subversion and git services commented on IMPALA-10961:
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Commit f0d4afaff1e8ed93834f5198046d137bcd03a843 in impala's branch
refs/heads/master from noemi
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=f0d4afa ]
IMPALA-11144: fix testAggregationNodeGroupByCardinalityCapping
IMPALA-10961 can decrease the size of the files in
functional_parquet.alltypes, which led to breaking the test that
rely on the file size.
Lowered the expected value, so it fits in the current tolerance range
of 0,05.
See the jira for more detailed analysis
Change-Id: I7956db444549c02fab3e56cb8bd281535f679776
Reviewed-on: http://gerrit.cloudera.org:8080/18264
Reviewed-by: Csaba Ringhofer <[email protected]>
Reviewed-by: Fang-Yu Rao <[email protected]>
Tested-by: Csaba Ringhofer <[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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