[jira] Commented: (PIG-1482) Pig gets confused when more than one loader is involved

["Xuefu Zhang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PIG-1482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12897053#action_12897053 ] 

Xuefu Zhang commented on PIG-1482:
----------------------------------

Manual Hudson run result:
     [exec] -1 overall.  
     [exec] 
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec] 
     [exec]     +1 tests included.  The patch appears to include 3 new or modified tests.
     [exec] 
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
     [exec] 
     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler warnings.
     [exec] 
     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs warnings.
     [exec] 
     [exec]     -1 release audit.  The applied patch generated 424 release audit warnings (more than the trunk's current 423 warnings).

The release audit diff was due to new public methods  introduced in Schema.java.

> Pig gets confused when more than one loader is involved
> -------------------------------------------------------
>
>                 Key: PIG-1482
>                 URL: https://issues.apache.org/jira/browse/PIG-1482
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.7.0
>            Reporter: Ankur
>            Assignee: Xuefu Zhang
>             Fix For: 0.8.0
>
>         Attachments: jira-1482-final.patch, jira-1482-final.patch
>
>
> In case of two relations being loaded using different loader, joined, grouped and projected, pig gets confused in trying to find appropriate loader for the requested cast. Consider the following script :-
> A = LOAD 'data1' USING PigStorage() AS (s, m, l);
> B = FOREACH A GENERATE s#'k1' as v1, m#'k2' as v2, l#'k3' as v3;
> C = FOREACH B GENERATE v1, (v2 == 'v2' ? 1L : 0L) as v2:long, (v3 == 'v3' ? 1 :0) as v3:int;
> D = LOAD 'data2' USING TextLoader() AS (a);
> E = JOIN C BY v1, D BY a USING 'replicated';
> F = GROUP E BY (v1, a);
> G = FOREACH F GENERATE (chararray)group.v1, group.a;
>         
> dump G;
> This throws the error, stack trace of which is in the next comment

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