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https://issues.apache.org/jira/browse/PIG-920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12770800#action_12770800
 ] 

Hadoop QA commented on PIG-920:
-------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12423365/PIG-920.patch
  against trunk revision 830335.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 6 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac 
compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of 
release audit warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: 
http://hudson.zones.apache.org/hudson/job/Pig-Patch-h7.grid.sp2.yahoo.net/118/testReport/
Findbugs warnings: 
http://hudson.zones.apache.org/hudson/job/Pig-Patch-h7.grid.sp2.yahoo.net/118/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: 
http://hudson.zones.apache.org/hudson/job/Pig-Patch-h7.grid.sp2.yahoo.net/118/console

This message is automatically generated.

> optimizing diamond queries
> --------------------------
>
>                 Key: PIG-920
>                 URL: https://issues.apache.org/jira/browse/PIG-920
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Olga Natkovich
>            Assignee: Richard Ding
>         Attachments: PIG-920.patch
>
>
> The following query
> A = load 'foo';
> B = filer A by $0>1;
> C = filter A by $1 = 'foo';
> D = COGROUP C by $0, B by $0;
> ......
> does not get efficiently executed. Currently, it runs a map only job that 
> basically reads and write the same data before doing the query processing.
> Query where the data is loaded twice actually executed more efficiently.
> This is not an uncommon query and we should fix this issue.

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