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Posted to dev@pig.apache.org by "Daniel Dai (JIRA)" <ji...@apache.org> on 2011/05/03 19:17:03 UTC
[jira] [Resolved] (PIG-1895) Class cast exception while projecting
udf result
[ https://issues.apache.org/jira/browse/PIG-1895?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Daniel Dai resolved PIG-1895.
-----------------------------
Resolution: Fixed
Fix Version/s: (was: 0.8.0)
0.8.1
Fixed by PIG-1866.
> Class cast exception while projecting udf result
> ------------------------------------------------
>
> Key: PIG-1895
> URL: https://issues.apache.org/jira/browse/PIG-1895
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: 0.7.0, 0.8.0, 0.9.0
> Reporter: Vivek Padmanabhan
> Assignee: Daniel Dai
> Fix For: 0.8.1
>
>
> Class cast exception is thrown when I try to project the result from my udf. The udf has a defined schema DataType.BAG,DataType.LONG and DataType.INTEGER
> The below is my script
> {code}
> Data = load 'file:/home/pvivek/Desktop/input' using PigStorage() as ( i: int );
> AllData = group Data all parallel 1;
> SampledData = foreach AllData generate org.vivek.TestEvalFunc(Data, 5) as rs;
> SampledData1 = foreach SampledData generate rs.sampled;
> {code}
> Even though the output schema defines "sampled" as a data bag, while processing, instead of sending only the data bag generated from the UDF , the entire tuple was sent to the projection as result.
> {code}
> Exception recieved :
> java.lang.ClassCastException: org.apache.pig.data.BinSedesTuple cannot be cast to org.apache.pig.data.DataBag
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.processInputBag(POProject.java:484)
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:197)
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.processInputBag(POProject.java:480)
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:197)
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:339)
> at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:291)
> at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Reduce.runPipeline(PigMapReduce.java:434)
> at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Reduce.processOnePackageOutput(PigMapReduce.java:402)
> at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Reduce.reduce(PigMapReduce.java:382)
> at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Reduce.reduce(PigMapReduce.java:1)
> at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:176)
> at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:566)
> at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:408)
> at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:216)
> {code}
> This issue is happening with 0.9/0.8 and 0.7
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