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https://issues.apache.org/jira/browse/PIG-1108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12782636#action_12782636
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Olga Natkovich commented on PIG-1108:
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How much work would it be to fix this?
Also, were you able to verify that disabling MQ works on 0.6.0 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
>
> 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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