Daniel Dai commented on PIG-644:

Also note this change may broke some existing scripts if they do contain 
duplicated schema alias.

> 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: 0.4.0
>            Reporter: Viraj Bhat
>            Assignee: Daniel Dai
>             Fix For: 0.6.0
>         Attachments: blah.txt, PIG-644-1.patch
> Consider the following Pig script where we generate column names b and b in 
> {code}
> DATA = LOAD 'blah.txt' as (a:long, b:long);
> RESULT = FOREACH DATA GENERATE a, b, (b>20?b:0) as b;
> dump RESULT;
> {code}
> 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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