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From "Jonathan Coveney (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PIG-3010) Allow UDF's to flatten themselves
Date Fri, 26 Oct 2012 18:33:13 GMT
Jonathan Coveney created PIG-3010:

             Summary: Allow UDF's to flatten themselves
                 Key: PIG-3010
                 URL: https://issues.apache.org/jira/browse/PIG-3010
             Project: Pig
          Issue Type: Improvement
            Reporter: Jonathan Coveney
            Assignee: Jonathan Coveney
             Fix For: 0.12

This is something I thought would be cool for a while, so I sat down and did it because I
think there are some useful debugging tools it'd help with.

The idea is that if you attach an annotation to a UDF, the Tuple or DataBag you output will
be flattened. This is quite powerful. A very common pattern is:

a = foreach data generate Flatten(MyUdf(thing)) as (a,b,c);

This would let you just do:

a = foreach data generate MyUdf(thing);

With the exact same result!

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