COUNT on null bag causes failure
--------------------------------
Key: PIG-1283
URL: https://issues.apache.org/jira/browse/PIG-1283
Project: Pig
Issue Type: Bug
Components: impl
Reporter: Thejas M Nair
grunt> l = load '/tmp/e.bag' as (b : bag{t: (i : int)}, a : int);
# 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
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