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https://issues.apache.org/jira/browse/PIG-1108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784378#action_12784378
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Olga Natkovich commented on PIG-1108:
-------------------------------------

+1. I will be committing this patch now to both trunk and branch

> Incorrect map output key type in MultiQuery optimization
> --------------------------------------------------------
>
>                 Key: PIG-1108
>                 URL: https://issues.apache.org/jira/browse/PIG-1108
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.6.0
>            Reporter: Ankur
>            Assignee: Richard Ding
>             Fix For: 0.6.0
>
>         Attachments: PIG-1108.patch
>
>
> When trying to merge 2 split plans, one of which never progresses along an 
> M/R boundary, PIG sets the map-output key type incorrectly resulting in the 
> following error:-
> java.io.IOException: Type mismatch in key from map: expected 
> org.apache.pig.impl.io.NullableText, recieved 
> org.apache.pig.impl.io.NullableTuple
>       at 
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.collect(MapTask.java:807)
>       at 
> org.apache.hadoop.mapred.MapTask$OldOutputCollector.collect(MapTask.java:466)
>       at 
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Map.collect(PigMapReduce.java:108)
>       at 
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:249)
>       at 
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:238)
>       at 
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Map.map(PigMapReduce.java:93)
>       at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
>       at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358)
>       at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
>       at org.apache.hadoop.mapred.Child.main(Child.java:159)
> Here is a small script to be used a reproducible test case
> rmf plan1
> rmf plan2
> A = LOAD 'data' USING PigStorage() as (a: int, b: chararray);
> SPLIT A into plan1 IF (a>5), plan2 IF (a<5);
> B = GROUP plan1 BY b;
> C = FOREACH B {
>               tmp = ORDER plan1 BY a desc;
>               GENERATE FLATTEN(group) as b, tmp;
>               };
> D = FILTER C BY b is not null;
> STORE D into 'plan1';
> STORE plan2 into 'plan2';

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