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https://issues.apache.org/jira/browse/PIG-2185?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Daniel Dai resolved PIG-2185.
-----------------------------
Resolution: Fixed
Fix Version/s: (was: 0.9.1)
Hadoop Flags: [Reviewed]
Patch committed to trunk. Thanks Santhosh!
> 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
> Affects Versions: 0.9.0
> Reporter: Mitesh Singh Jat
> Assignee: Daniel Dai
> Fix For: 0.10
>
> Attachments: PIG-2185-1.patch, PIG-2185-2.patch
>
>
> 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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