Hadoop QA commented on PIG-935:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 806668.

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

    +1 tests included.  The patch appears to include 3 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 failed core unit tests.

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

Test results: 
Findbugs warnings: 
Console output: 

This message is automatically generated.

> Skewed join throws an exception when used with map keys
> -------------------------------------------------------
>                 Key: PIG-935
>                 URL: https://issues.apache.org/jira/browse/PIG-935
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Sriranjan Manjunath
>         Attachments: skjoinmapbug.patch
> Skewed join throws a runtime exception for the following query:
> A = load 'map.txt' as (e);
> B = load 'map.txt' as (f);
> C = join A by (chararray)e#'a', B by (chararray)f#'a' using "skewed";
> explain C;
> Exception:
> Caused by: java.lang.ClassCastException: 
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POCast
>  cannot be cast to 
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.PO
> Project
>         at 
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MRCompiler.getSortCols(MRCompiler.java:1492)
>         at 
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MRCompiler.getSamplingJob(MRCompiler.java:1894)
>         ... 27 more

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