MultiQuery optimization in some cases has an issue when there is a split in the
map plan
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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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