"as" support for group-by

                 Key: PIG-678
                 URL: https://issues.apache.org/jira/browse/PIG-678
             Project: Pig
          Issue Type: Improvement
            Reporter: Christopher Olston

I should be able to use "as" with GROUP the same way I use it with LOAD, i.e. 
rename the entire schema. This is especially important b/c the system 
automatically assigns schema names for the output of group that many people 
find unintuitive.

e.g. this should work:

grouped = GROUP data BY url AS (url, history);

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