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Posted to dev@pig.apache.org by "Santhosh Srinivasan (JIRA)" <ji...@apache.org> on 2008/12/04 20:30:44 UTC
[jira] Commented: (PIG-550) java.lang.ClassCastException:
java.lang.String cannot be cast to org.apache.pig.data.Tuple
[ https://issues.apache.org/jira/browse/PIG-550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653424#action_12653424 ]
Santhosh Srinivasan commented on PIG-550:
-----------------------------------------
The issue is similar to the bug reported in PIG-449.
> java.lang.ClassCastException: java.lang.String cannot be cast to org.apache.pig.data.Tuple
> ------------------------------------------------------------------------------------------
>
> Key: PIG-550
> URL: https://issues.apache.org/jira/browse/PIG-550
> Project: Pig
> Issue Type: Bug
> Affects Versions: types_branch
> Reporter: Viraj Bhat
> Fix For: types_branch
>
>
> ======================================================================================================================
> Map tasks resulting from the below Pig Script throws the following exception. Note 'one' is a dummy input containing, number 1.
> ======================================================================================================================
> {code}
> A = load 'one' using PigStorage() as ( one );
> B = foreach A generate
> {
> (
> ('p1-t1-e1', 'p1-t1-e2'),
> ('p1-t2-e1', 'p1-t2-e2')
> ),
> (
> ('p2-t1-e1', 'p2-t1-e2'),
> ('p2-t2-e1', 'p2-t2-e2')
> )
> };
> describe B;
> C = foreach B generate
> $0 as pairbag { pair: ( t1: (e1, e2), t2: (e1, e2) ) }; describe C;
> D = foreach C generate FLATTEN(pairbag);
> describe D;
> E = foreach D generate
> pair.t1.e2 as t1e2,
> pair.t2.e1 as t2e1;
> describe E;
> dump E;
> {code}
> ======================================================================================================================
> 2008-12-01 20:07:53,974 [main] ERROR org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.Launcher - Error message from task (map) task_200810152105_0207_m_000000java.lang.ClassCastException: java.lang.String cannot be cast to org.apache.pig.data.Tuple
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:279)
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:226)
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:133)
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:233)
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:254)
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:180)
> at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:170)
> at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:158)
> at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapOnly$Map.map(PigMapOnly.java:65)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:47)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:227)
> at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2209)
> ======================================================================================================================
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