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https://issues.apache.org/jira/browse/PIG-1895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13006757#comment-13006757
]
Daniel Dai commented on PIG-1895:
---------------------------------
TestEvalFunc forget to set twolevelaccess flag for the bag. Pig 0.9 does not
require twolevelaccess flag. However, we saw Pig 0.9 fail with a different
stack:
ERROR 1000: Invalid field reference. Referenced field [guid] does not exist in
schema: null.
org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1067: Unable to
explain alias C3
at org.apache.pig.PigServer.explain(PigServer.java:993)
at
org.apache.pig.tools.grunt.GruntParser.explainCurrentBatch(GruntParser.java:368)
at
org.apache.pig.tools.grunt.GruntParser.processExplain(GruntParser.java:300)
at
org.apache.pig.tools.grunt.GruntParser.processExplain(GruntParser.java:263)
at
org.apache.pig.tools.pigscript.parser.PigScriptParser.Explain(PigScriptParser.java:665)
at
org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:325)
at
org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:176)
at
org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:152)
at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:90)
at org.apache.pig.Main.run(Main.java:537)
at org.apache.pig.Main.main(Main.java:108)
Caused by: org.apache.pig.impl.plan.PlanValidationException: ERROR 1000:
Invalid field reference. Referenced field [guid] does not exist in schema: null.
at
org.apache.pig.newplan.logical.visitor.ColumnAliasConversionVisitor$1.visit(ColumnAliasConversionVisitor.java:114)
at
org.apache.pig.newplan.logical.expression.DereferenceExpression.accept(DereferenceExpression.java:83)
at
org.apache.pig.newplan.DependencyOrderWalker.walk(DependencyOrderWalker.java:75)
at org.apache.pig.newplan.PlanVisitor.visit(PlanVisitor.java:50)
at
org.apache.pig.newplan.logical.optimizer.AllExpressionVisitor.visit(AllExpressionVisitor.java:114)
at
org.apache.pig.newplan.logical.relational.LOGenerate.accept(LOGenerate.java:240)
at
org.apache.pig.newplan.DependencyOrderWalker.walk(DependencyOrderWalker.java:75)
at
org.apache.pig.newplan.logical.optimizer.AllExpressionVisitor.visit(AllExpressionVisitor.java:104)
at
org.apache.pig.newplan.logical.relational.LOForEach.accept(LOForEach.java:73)
at
org.apache.pig.newplan.DependencyOrderWalker.walk(DependencyOrderWalker.java:75)
at org.apache.pig.newplan.PlanVisitor.visit(PlanVisitor.java:50)
at org.apache.pig.PigServer$Graph.compile(PigServer.java:1538)
at org.apache.pig.PigServer$Graph.compile(PigServer.java:1533)
at org.apache.pig.PigServer$Graph.access$200(PigServer.java:1295)
at org.apache.pig.PigServer.buildStorePlan(PigServer.java:1195)
at org.apache.pig.PigServer.explain(PigServer.java:956)
> 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: 0.8.0
>
>
> 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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