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From "Sriranjan Manjunath (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-935) Skewed join throws an exception when used with map keys
Date Wed, 26 Aug 2009 18:37:59 GMT
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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