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https://issues.apache.org/jira/browse/PIG-913?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12742124#action_12742124
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Daniel Dai commented on PIG-913:
--------------------------------

Thanks, Dmitriy, 
I will put unit test. I submit it first to see if it broke any existing unit 
test first.

> Error in Pig script when grouping on chararray column
> -----------------------------------------------------
>
>                 Key: PIG-913
>                 URL: https://issues.apache.org/jira/browse/PIG-913
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.4.0
>            Reporter: Viraj Bhat
>            Priority: Critical
>             Fix For: 0.4.0
>
>         Attachments: PIG-913.patch
>
>
> I have a very simple script which fails at parsetime due to the schema I 
> specified in the loader.
> {code}
> data = LOAD '/user/viraj/studenttab10k' AS (s:chararray);
> dataSmall = limit data 100;
> bb = GROUP dataSmall by $0;
> dump bb;
> {code}
> =====================================================================================================================
> 2009-08-06 18:47:56,297 [main] INFO  org.apache.pig.Main - Logging error 
> messages to: /homes/viraj/pig-svn/trunk/pig_1249609676296.log
> 09/08/06 18:47:56 INFO pig.Main: Logging error messages to: 
> /homes/viraj/pig-svn/trunk/pig_1249609676296.log
> 2009-08-06 18:47:56,459 [main] INFO  
> org.apache.pig.backend.hadoop.executionengine.HExecutionEngine - Connecting 
> to hadoop file system at: hdfs://localhost:9000
> 09/08/06 18:47:56 INFO executionengine.HExecutionEngine: Connecting to hadoop 
> file system at: hdfs://localhost:9000
> 2009-08-06 18:47:56,694 [main] INFO  
> org.apache.pig.backend.hadoop.executionengine.HExecutionEngine - Connecting 
> to map-reduce job tracker at: localhost:9001
> 09/08/06 18:47:56 INFO executionengine.HExecutionEngine: Connecting to 
> map-reduce job tracker at: localhost:9001
> 2009-08-06 18:47:57,008 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 
> 1002: Unable to store alias bb
> 09/08/06 18:47:57 ERROR grunt.Grunt: ERROR 1002: Unable to store alias bb
> Details at logfile: /homes/viraj/pig-svn/trunk/pig_1249609676296.log
> =====================================================================================================================
> =====================================================================================================================
> Pig Stack Trace
> ---------------
> ERROR 1002: Unable to store alias bb
> org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1066: Unable to 
> open iterator for alias bb
>         at org.apache.pig.PigServer.openIterator(PigServer.java:481)
>         at 
> org.apache.pig.tools.grunt.GruntParser.processDump(GruntParser.java:531)
>         at 
> org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:190)
>         at 
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:165)
>         at 
> org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:141)
>         at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:89)
>         at org.apache.pig.Main.main(Main.java:397)
> Caused by: org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1002: 
> Unable to store alias bb
>         at org.apache.pig.PigServer.store(PigServer.java:536)
>         at org.apache.pig.PigServer.openIterator(PigServer.java:464)
>         ... 6 more
> Caused by: java.lang.NullPointerException
>         at 
> org.apache.pig.impl.logicalLayer.LOCogroup.unsetSchema(LOCogroup.java:359)
>         at 
> org.apache.pig.impl.logicalLayer.optimizer.SchemaRemover.visit(SchemaRemover.java:64)
>         at 
> org.apache.pig.impl.logicalLayer.LOCogroup.visit(LOCogroup.java:335)
>         at org.apache.pig.impl.logicalLayer.LOCogroup.visit(LOCogroup.java:46)
>         at 
> org.apache.pig.impl.plan.DependencyOrderWalker.walk(DependencyOrderWalker.java:68)
>         at org.apache.pig.impl.plan.PlanVisitor.visit(PlanVisitor.java:51)
>         at 
> org.apache.pig.impl.logicalLayer.optimizer.LogicalTransformer.rebuildSchemas(LogicalTransformer.java:67)
>         at 
> org.apache.pig.impl.logicalLayer.optimizer.LogicalOptimizer.optimize(LogicalOptimizer.java:187)
>         at org.apache.pig.PigServer.compileLp(PigServer.java:854)
>         at org.apache.pig.PigServer.compileLp(PigServer.java:791)
>         at org.apache.pig.PigServer.store(PigServer.java:509)
>         ... 7 more
> =====================================================================================================================

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