Pradeep Kamath updated PIG-690:

        Fix Version/s: types_branch
             Assignee: Pradeep Kamath
    Affects Version/s: types_branch
               Status: Patch Available  (was: Open)

The root cause of the issue is while merging schemas, the code recursively 
merges subschemas if a field is a tuple or a bag. At that point, it does not 
properly attribute the type to be bag if that was the case. It always marks the 
type as tuple whenever the field schema is of type bag or tuple. This is fixed 
in the patch and a unit test case has been added which tries to union two 
relations which have a bag field. 

> UNION doesn't work in the latest code
> -------------------------------------
>                 Key: PIG-690
>                 URL: https://issues.apache.org/jira/browse/PIG-690
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: types_branch
>         Environment: mapred mode. local mode.has the same problem under linux.
> code is taken from trunk
>            Reporter: Amir Youssefi
>            Assignee: Pradeep Kamath
>             Fix For: types_branch
>         Attachments: PIG-690.patch
> grunt> a = load 'tmp/f1' using BinStorage();
> grunt> b = load 'tmp/f2' using BinStorage();
> grunt> describe a;
> a: {int,chararray,int,{(int,chararray,chararray)}}
> grunt> describe b;
> b: {int,chararray,int,{(int,chararray,chararray)}}
> grunt> c = union a,b;
> grunt> describe c;
> 2009-02-27 11:51:46,012 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 
> 1052: Cannot cast bag with schema bag({(int,chararray,chararray)}) to tuple 
> with schema tuple
> Details at logfile: /homes/amiry/pig_1235735380348.log
> dump a and dump b work fine.
> Sample data provided to dev team in an e-mail.

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