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https://issues.apache.org/jira/browse/IMPALA-13901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17984983#comment-17984983
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ASF subversion and git services commented on IMPALA-13901:
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Commit 060432595886bc9660cdea1a7c0c615f24f44017 in impala's branch
refs/heads/master from Joe McDonnell
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=060432595 ]
IMPALA-13901: Make histogram/sample/group_concat ineligible for tuple caching
"histogram" and "sample" rely on the same code as "appx_median"
and incorporate randomness. "group_concat" is entirely dependent
on the order of inputs. This expands tuple caching's list of
ineligible functions to include these variable aggregate functions.
Testing:
- Added test cases to TupleCacheTest for these functions
Change-Id: Ibb017dd4297a3bb219ffed2bd9abc94e6c5b2605
Reviewed-on: http://gerrit.cloudera.org:8080/22668
Reviewed-by: Michael Smith <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
Reviewed-by: Yida Wu <[email protected]>
> Make "histogram","sample", and "group_concat" ineligible for tuple caching
> --------------------------------------------------------------------------
>
> Key: IMPALA-13901
> URL: https://issues.apache.org/jira/browse/IMPALA-13901
> Project: IMPALA
> Issue Type: Task
> Components: Frontend
> Affects Versions: Impala 5.0.0
> Reporter: Joe McDonnell
> Assignee: Joe McDonnell
> Priority: Major
>
> "histogram" and "sample" use the same infrastructure as "appx_median", which
> includes randomness. These functions should be marked ineligible for tuple
> caching. This came up in some test cases when running with tuple cache
> verification.
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