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https://issues.apache.org/jira/browse/PIG-2306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13114979#comment-13114979
]
Doug Daniels commented on PIG-2306:
-----------------------------------
I just discovered that the syntax I used has "group.x" for a one-item group
key, when it should actually be just "group". Changing it to "group" makes the
tests pass.
I'm still getting this Exception with a more complicated script; I'll try to
whittle it down to a minimal test case.
> Exception from ILLUSTRATE on COGROUP / FOREACH
> ----------------------------------------------
>
> Key: PIG-2306
> URL: https://issues.apache.org/jira/browse/PIG-2306
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.9.0
> Reporter: Doug Daniels
> Attachments: PIG-2306-test_cases.patch
>
>
> I'm getting a ClassCastException trying to use ILLUSTRATE on a COGROUP
> followed by a FOREACH. I've added two test cases to TestExampleGenerator
> that produce the Exception (see attached patch). I also added two small
> changes to PigServer to bubble the Exception upward inside the error log
> message.
>
> The Exception is:
> {code}
> Exception : org.apache.pig.data.DataByteArray cannot be cast to
> org.apache.pig.data.Tuple
> java.io.IOException: Exception : org.apache.pig.data.DataByteArray cannot be
> cast to org.apache.pig.data.Tuple
> at org.apache.pig.PigServer.getExamples(PigServer.java:1207)
> at
> org.apache.pig.test.TestExampleGenerator.testCogroupWithForEachFlatten(TestExampleGenerator.java:271)
> Caused by: java.lang.ClassCastException: org.apache.pig.data.DataByteArray
> cannot be cast to org.apache.pig.data.Tuple
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:462)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:290)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:158)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:340)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:320)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:332)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:284)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.runPipeline(PigGenericMapReduce.java:459)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.processOnePackageOutput(PigGenericMapReduce.java:427)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.reduce(PigGenericMapReduce.java:407)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Reduce.reduce(PigGenericMapReduce.java:261)
> at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:176)
> at
> org.apache.pig.pen.LocalMapReduceSimulator.launchPig(LocalMapReduceSimulator.java:222)
> at
> org.apache.pig.pen.ExampleGenerator.getData(ExampleGenerator.java:257)
> at
> org.apache.pig.pen.ExampleGenerator.getData(ExampleGenerator.java:238)
> at
> org.apache.pig.pen.LineageTrimmingVisitor.init(LineageTrimmingVisitor.java:103)
> at
> org.apache.pig.pen.LineageTrimmingVisitor.<init>(LineageTrimmingVisitor.java:98)
> at
> org.apache.pig.pen.ExampleGenerator.getExamples(ExampleGenerator.java:166)
> at org.apache.pig.PigServer.getExamples(PigServer.java:1201)
> {code}
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