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https://issues.apache.org/jira/browse/PIG-835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12717817#action_12717817
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Olga Natkovich commented on PIG-835:
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+1, the patch looks good.
> Multiquery optimization does not handle the case where the map keys in the
> split plans have different key types (tuple and non tuple key type)
> ----------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: PIG-835
> URL: https://issues.apache.org/jira/browse/PIG-835
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.2.1
> Reporter: Pradeep Kamath
> Assignee: Pradeep Kamath
> Fix For: 0.3.0
>
> Attachments: PIG-835-v2.patch, PIG-835.patch
>
>
> A query like the following results in an exception on execution:
> {noformat}
> a = load 'mult.input' as (name, age, gpa);
> b = group a ALL;
> c = foreach b generate group, COUNT(a);
> store c into 'foo';
> d = group a by (name, gpa);
> e = foreach d generate flatten(group), MIN(a.age);
> store e into 'bar';
> {noformat}
> Exception on execution:
> 09/06/04 16:56:11 INFO mapred.TaskInProgress: Error from
> attempt_200906041655_0001_r_000000_3: java.lang.ClassCastException:
> java.lang.String cannot be cast to org.apache.pig.data.Tuple
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:312)
> 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.POStore.getNext(POStore.java:117)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.PODemux.runPipeline(PODemux.java:248)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.PODemux.getNext(PODemux.java:238)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Reduce.runPipeline(PigMapReduce.java:320)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Reduce.processOnePackageOutput(PigMapReduce.java:288)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Reduce.reduce(PigMapReduce.java:268)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Reduce.reduce(PigMapReduce.java:142)
> at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:318)
> at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2207)
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