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From "George Mavromatis (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-822) Flatten semantics are unknown
Date Fri, 29 May 2009 02:06:45 GMT
Flatten semantics are unknown
-----------------------------

                 Key: PIG-822
                 URL: https://issues.apache.org/jira/browse/PIG-822
             Project: Pig
          Issue Type: Bug
          Components: documentation
            Reporter: George Mavromatis
            Priority: Critical


There is no formal specification of the flatten keyword in http://hadoop.apache.org/pig/docs/r0.2.0/piglatin.html

There are only some examples.

I have found flatten to be very fragile and unpredictable with the data types it reads and
creates. I have wasted too many hours (and Viraj too) trying to figure out its peculiarities,
the latest of which is here: http://bug.corp.yahoo.com/show_bug.cgi?id=2768016 comment #15

Please document:
Flatten to be explained formally in its own dedicated section: What are the valid input types,
the output types it creates, what transformation it does from input to output and how the
resulting data are named.



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