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
         Environment: mapred mode, trunk. It doesn't affect local mode.
            Reporter: Amir Youssefi

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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