Duplicate column names in foreach do not throw parser error

                 Key: PIG-644
                 URL: https://issues.apache.org/jira/browse/PIG-644
             Project: Pig
          Issue Type: Bug
          Components: impl
    Affects Versions: types_branch
            Reporter: Viraj Bhat
             Fix For: types_branch

Consider the following Pig script where we generate column names b and b in the 
DATA = LOAD 'blah.txt' as (a:long, b:long);
RESULT = FOREACH DATA GENERATE a, b, (b>20?b:0) as b;
dump RESULT;

Pig runs the script successfully and does not complain of the duplicate column 
names.  I do not know if the new error handling framework will handle these 
kinds of cases. 

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