Hadoop QA commented on PIG-920:

+1 overall.  Here are the results of testing the latest attachment 
  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: 
Findbugs warnings: 
Console output: 

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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