Benjamin Reed reassigned PIG-822:

    Assignee: Benjamin Reed

> 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
>            Assignee: Benjamin Reed
>            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. 
> 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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