[ https://issues.apache.org/jira/browse/PIG-1108?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Richard Ding reassigned PIG-1108: --------------------------------- Assignee: Richard Ding > 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'; -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.