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From "Anand L Ranganathan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-1283) COUNT on null bag causes failure
Date Sun, 14 Oct 2012 06:46:04 GMT

    [ https://issues.apache.org/jira/browse/PIG-1283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13475780#comment-13475780
] 

Anand L Ranganathan commented on PIG-1283:
------------------------------------------

Please find  pig_1283-3.patch for this bug.
I added the changes suggested by Jonathan.
                
> 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
>            Assignee: Anand L Ranganathan
>              Labels: newbie
>         Attachments: PIG-1283-1.patch, PIG-1283-2.patch, pig_1283-3.patch
>
>
> 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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