[PIG-1283] COUNT on null bag causes failure

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.11
• Component/s: impl
• Labels: newbie
• Assignee: Anandha L Ranganathan
• Reporter: Thejas Nair
• Created: 08/Mar/10 22:09
• Updated: 24/Mar/14 18:27
• Resolved: 18/Oct/12 23:28

Description

grunt> l = load '/tmp/e.bag' as (b : bag

{t: (i : int)}

, a : int);

1. b is null for the only row
   grunt> c = foreach l generate COUNT(b);
   grunt> dump c

It results in following exception-

org.apache.pig.backend.executionengine.ExecException: ERROR 2106: Error while computing count in COUNT
at org.apache.pig.builtin.COUNT.exec(COUNT.java:59)
at org.apache.pig.builtin.COUNT.exec(COUNT.java:39)
at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:212)
at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:293)
at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:358)
at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:288)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:232)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:227)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:52)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:583)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:176)
Caused by: java.lang.NullPointerException
at org.apache.pig.builtin.COUNT.exec(COUNT.java:46)
... 12 more