Skewed join throws an exception when used with map keys
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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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