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https://issues.apache.org/jira/browse/IMPALA-13246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17874060#comment-17874060
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ASF subversion and git services commented on IMPALA-13246:
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Commit cf28745d3e4a8d50ac4c713c48d629a08455437c in impala's branch
refs/heads/master from Csaba Ringhofer
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=cf28745d3 ]
IMPALA-13246: Smallify strings during broadcast exchange
Other changes:
- adds smallifying of strings in collections
- removes Tuple::SmallifyStrings() and smallifies during deep copy
instead - this seems somewhat slower in TPC-H, but is safer as
it doesn't rely on the assumption that smallify is always done
for the whole tuple (it turned out that this is not true in some
cases)
Measured 0.5-1% improvement in TPCH(42).
note that there is a very similar WIP change:
https://gerrit.cloudera.org/#/c/21508/
Change-Id: I281d77c7a241ebfe8716eb5c975f0660601aec1b
Reviewed-on: http://gerrit.cloudera.org:8080/21597
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
> Smallify strings during broadcast exchange
> ------------------------------------------
>
> Key: IMPALA-13246
> URL: https://issues.apache.org/jira/browse/IMPALA-13246
> Project: IMPALA
> Issue Type: Sub-task
> Components: Backend
> Reporter: Csaba Ringhofer
> Assignee: Csaba Ringhofer
> Priority: Major
>
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