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https://issues.apache.org/jira/browse/PIG-976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12768445#action_12768445
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Daniel Dai commented on PIG-976:
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+1, fix is good.
> Multi-query optimization throws ClassCastException
> --------------------------------------------------
>
> Key: PIG-976
> URL: https://issues.apache.org/jira/browse/PIG-976
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: 0.4.0
> Reporter: Ankur
> Assignee: Richard Ding
> Fix For: 0.6.0
>
> Attachments: PIG-976.patch, PIG-976.patch, PIG-976.patch,
> PIG-976.patch, PIG-976.patch, PIG-976_1.patch
>
>
> Multi-query optimization fails to merge 2 branches when 1 is a result of
> Group By ALL and another is a result of Group By field1 where field 1 is of
> type long. Here is the script that fails with multi-query on.
> data = LOAD 'test' USING PigStorage('\t') AS (a:long, b:double, c:double);
> A = GROUP data ALL;
> B = FOREACH A GENERATE SUM(data.b) AS sum1, SUM(data.c) AS sum2;
> C = FOREACH B GENERATE (sum1/sum2) AS rate;
> STORE C INTO 'result1';
> D = GROUP data BY a;
> E = FOREACH D GENERATE group AS a, SUM(data.b), SUM(data.c);
> STORE E into 'result2';
>
> Here is the exception from the logs
> java.lang.ClassCastException: org.apache.pig.data.DefaultTuple cannot be cast
> to org.apache.pig.data.DataBag
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.processInputBag(POProject.java:399)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:180)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.processInput(POUserFunc.java:145)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:197)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:235)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:254)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:204)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:231)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLocalRearrange.getNext(POLocalRearrange.java:240)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.PODemux.runPipeline(PODemux.java:264)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.PODemux.getNext(PODemux.java:254)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigCombiner$Combine.processOnePackageOutput(PigCombiner.java:196)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigCombiner$Combine.reduce(PigCombiner.java:174)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigCombiner$Combine.reduce(PigCombiner.java:63)
> at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.combineAndSpill(MapTask.java:906)
> at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:786)
> at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:698)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:228)
> at
> org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2206)
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