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https://issues.apache.org/jira/browse/PIG-750?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thejas M Nair updated PIG-750:
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Attachment: PIG-750.1.patch
PIG-750.1.patch - This patch also fixes jira PIG-490 .
In test patch results, the release audit warning is a false alarm, it is
complaining about a generated docs diff file.
[exec] -1 overall.
[exec]
[exec] +1 @author. The patch does not contain any @author tags.
[exec]
[exec] +1 tests included. The patch appears to include 6 new or
modified tests.
[exec]
[exec] +1 javadoc. The javadoc tool did not generate any warning
messages.
[exec]
[exec] +1 javac. The applied patch does not increase the total number
of javac compiler warnings.
[exec]
[exec] +1 findbugs. The patch does not introduce any new Findbugs
warnings.
[exec]
[exec] -1 release audit. The applied patch generated 501 release
audit warnings (more than the trunk's current 500 warnings).
I have run unit tests all pass, but I am running it again after some cosmetic
changes.
> Use combiner when algebraic UDFs are used in expressions
> --------------------------------------------------------
>
> Key: PIG-750
> URL: https://issues.apache.org/jira/browse/PIG-750
> Project: Pig
> Issue Type: Improvement
> Reporter: Amir Youssefi
> Assignee: Thejas M Nair
> Priority: Minor
> Attachments: PIG-750.1.patch
>
>
> Currently Pig uses combiner when all a,b, c,... are algebraic (e.g. SUM, AVG
> etc.) in foreach:
> foreach X generate a,b,c,...
> It's a performance improvement if it uses combiner when a mix of algebraic
> and non-algebraic functions are used as well.
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