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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1877) map constants not working properly in filter statements
Date Wed, 02 Mar 2011 01:08:36 GMT

    [ https://issues.apache.org/jira/browse/PIG-1877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13001221#comment-13001221
] 

Alan Gates commented on PIG-1877:
---------------------------------

Tuple constants appear to have the same issue.

> map constants not working properly in filter statements
> -------------------------------------------------------
>
>                 Key: PIG-1877
>                 URL: https://issues.apache.org/jira/browse/PIG-1877
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: 0.8.0
>            Reporter: Alan Gates
>            Priority: Minor
>
> The Pig Latin script:
> {code}
> A = load '/Users/gates/test/data/studenttab10' as (a:map[], b:tuple(), c:bag{});
> B = filter A by a == ['name'#'bob', 'age'#55];
> dump B;
> {code}
> runs but produces the error:
> {code}
> java.lang.ClassCastException: java.util.HashMap cannot be cast to org.apache.pig.data.DataByteArray
>         at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.ConstantExpression.getNext(ConstantExpression.java:112)
>         at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.EqualToExpr.getNext(EqualToExpr.java:75)
>         at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POFilter.getNext(POFilter.java:148)
>         at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:276)
>         at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:240)
>         at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:236)
>         at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:231)
>         at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:53)
>         at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
>         at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:621)
>         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
>         at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:177)
> {code}
> But if I change the script to
> {code}
> A = load '/Users/gates/test/data/studenttab10' as (a:map[], b:tuple(), c:bag{});
> B = foreach A generate a, ['name'#'bob', 'age'#55] as b;
> C = filter B by a == b;
> dump C;
> {code}
> which is semantically equivalent, the job passes.

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