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From "Daniel Dai (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-2493) UNION causes casting issues
Date Thu, 02 Feb 2012 06:47:53 GMT

    [ https://issues.apache.org/jira/browse/PIG-2493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13198563#comment-13198563
] 

Daniel Dai commented on PIG-2493:
---------------------------------

Couple of comments:
1. Shall we use addUidLoadFuncToMap instead of manipulating uid2LoadFuncMap directly?
2. Do we need to add every field to uid2LoadFuncMap instead of just field 0?
                
> UNION causes casting issues
> ---------------------------
>
>                 Key: PIG-2493
>                 URL: https://issues.apache.org/jira/browse/PIG-2493
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.9.1, 0.10
>            Reporter: Anitha Raju
>         Attachments: PIG-2493.patch
>
>
> Hi,
> For the below script,
> {code}
> A = load '/user/anithar/ip' as (a);
> B = load '/user/anithar/ip1' as (a);
> C = union  A , B ;
> D = foreach C generate (chararray)a;
> dump D;
> {code}
> it gives casting error at runtime
> {code}
> org.apache.pig.backend.executionengine.ExecException: ERROR 1075: Received a bytearray
from the UDF. Cannot determine how to convert the bytearray to string.
>         at org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POCast.getNext(POCast.java:660)
>         at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:322)
>         at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:332)
>         at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:284)
>         at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.runPipeline(PigGenericMapBase.java:267)
>         at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:262)
>         at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:64)
>         at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
>         at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
>         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
>         at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at javax.security.auth.Subject.doAs(Subject.java:396)
>         at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1082)
>         at org.apache.hadoop.mapred.Child.main(Child.java:249)
> {code}
> It looks like in POCast.java the value of "funcSpec" is not getting any value(stays null
when there is a UNION involved), causing "caster" to get null and thus the exception.
> The same works in 0.8 without any issue.
> Regards,
> Anitha

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