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https://issues.apache.org/jira/browse/PIG-935?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sriranjan Manjunath updated PIG-935:
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Status: Open (was: Patch Available)
> 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, 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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