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From "Pradeep Kamath (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-846) MultiQuery optimization in some cases has an issue when there is a split in the map plan
Date Fri, 12 Jun 2009 20:55:07 GMT
MultiQuery optimization in some cases has an issue when there is a split in the map plan 
-----------------------------------------------------------------------------------------

                 Key: PIG-846
                 URL: https://issues.apache.org/jira/browse/PIG-846
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.2.1
            Reporter: Pradeep Kamath
            Assignee: Pradeep Kamath
             Fix For: 0.3.0


The following script produces the error that follows:
{noformat}
A = LOAD 'input.txt' as (f0, f1, f2, f3, f4, f5, f6, f7, f8); 
B = FOREACH A GENERATE f0, f1, f2, f3, f4;
B1 = foreach B generate f0, f1, f2;
C = GROUP B1 BY (f1, f2);
STORE C into 'foo1';

B2 = FOREACH B GENERATE f0, f3, f4;
E = GROUP B2 BY (f3, f4);
STORE E into 'foo2';

F = FOREACH A GENERATE f0, f5, f6;
 G = GROUP F BY (f5, f6);
STORE G into 'foo3';

H  = FOREACH A GENERATE f0, f7, f8;
I = GROUP H BY (f7, f8);
STORE I into 'foo4';

{noformat}

Exception encountered during execution:
{noformat}
java.lang.NullPointerException
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POPackage.getValueTuple(POPackage.java:262)
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POPackage.getNext(POPackage.java:209)
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POMultiQueryPackage.getNext(POMultiQueryPackage.java:186)
	at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POMultiQueryPackage.getNext(POMultiQueryPackage.java:186)
	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Reduce.processOnePackageOutput(PigMapReduce.java:277)
	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$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)

{noformat}

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