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: 0.8.0, 0.7.0, 0.9.0
Reporter: Vivek Padmanabhan
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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