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


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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