NullPointerException while Accessing Empty Bag in FOREACH { FILTER }
--------------------------------------------------------------------
Key: PIG-2185
URL: https://issues.apache.org/jira/browse/PIG-2185
Project: Pig
Issue Type: Bug
Reporter: Mitesh Singh Jat
On doing FILTERing on empty bag inside FOREACH, NullPointerException occurs.
The following pig script demonstrates the issue:
{code title=empty_bag.pig}
A = LOAD 'input/empty_bag.in' USING PigStorage() AS (bg:bag{}, ch:chararray);
B = FOREACH A {
x = FILTER bg BY $0 == '12';
GENERATE
*,
x;
};
DUMP B;
{code}
Input is:
{code title=input/empty_bag.in}
{(12)} a
{(23)} b
c
{code}
Upon execution of Pig Script empty_bag.pig, the NullPointerException comes as
shown below:
{code}
$ pig -x local empty_bag.pig
...
2011-07-11 09:52:56,810 [Thread-3] WARN
org.apache.hadoop.mapred.LocalJobRunner - job_local_0001
java.lang.NullPointerException
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:448)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:290)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POFilter.getNext(POFilter.java:95)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:406)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.processInputBag(POProject.java:570)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.PORelationToExprProject.getNext(PORelationToExprProject.java:107)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:316)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.processInput(POUserFunc.java:159)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:184)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:258)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:316)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:332)
at
org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:284)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:261)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:256)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:58)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
at
org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:210)
...
{code}
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