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From "Olga Natkovich (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (PIG-399) limit interfers with types in filter
Date Mon, 25 Aug 2008 20:35:44 GMT

     [ https://issues.apache.org/jira/browse/PIG-399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Olga Natkovich reassigned PIG-399:
----------------------------------

    Assignee: Alan Gates

> limit interfers with types in filter
> ------------------------------------
>
>                 Key: PIG-399
>                 URL: https://issues.apache.org/jira/browse/PIG-399
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Olga Natkovich
>            Assignee: Alan Gates
>
> The following script fails:
> A = load 'data' as (name: chararray, age: chararray, gpa: float);
> B = limit A 40;
> C = filter B by age eq '40';
> D = group C by name;
> E = foreach D generate group, COUNT(C);
> dump E;
> If limit is removed, the script runs without any problems. The explain shows that filter
looses type of the non-constant operand.
> The errror is
> 8/08/25 13:34:15 INFO mapReduceLayer.MapReduceLauncher: Unsuccessful attempt. Completed
0.0% of the job
> 08/08/25 13:34:15 ERROR mapReduceLayer.Launcher: Error message from task (reduce) tip_200808131548_2163_r_000000java.lang.ClassCastException:
java.lang.String cannot be cast to org.apache.pig.data.DataByteArray
>         at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.ConstantExpression.getNext(ConstantExpression.java:111)
>         at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.EqualToExpr.getNext(EqualToExpr.java:68)
>         at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POFilter.getNext(POFilter.java:147)
>         at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Reduce.reduce(PigMapReduce.java:169)
>         at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Reduce.reduce(PigMapReduce.java:87)
>         at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:391)
>         at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2124)

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