column pruning causing failure when foreach has user-specified schema
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                 Key: PIG-1128
                 URL: https://issues.apache.org/jira/browse/PIG-1128
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.6.0, 0.7.0
            Reporter: Thejas M Nair


Issue is seen in 0.6.0 and trunk.

grunt> l = load 'dummy.txt' as ( c1 : chararray,  c2 : int);                    
               
grunt> f1 = foreach l generate c1 as c1 : chararray, c2 as c2 : int, 'CA' as 
state : chararray;
grunt> f2 = foreach f1 generate c1 as c1 : chararray;                           
               
grunt> explain f2;
2009-12-04 13:11:19,010 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 
1022: Type mismatch merging schema prefix. Field Schema: chararray. Other Field 
Schema: c2: int


( it does not matter if the new schema has new/different column name - )
grunt>l = load 'dummy.txt' as ( c1 : chararray,  c2 : int);
grunt>f1 = foreach l generate c1 as c11 : chararray, c2 as c22 : int, 'CA' as 
state : chararray;
grunt>f2 = foreach f1 generate c11 as c111 : chararray;
grunt> explain f2;
2009-12-04 13:13:01,462 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 
1022: Type mismatch merging schema prefix. Field Schema: chararray. Other Field 
Schema: c22: int


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