[jira] Assigned: (PIG-822) Flatten semantics are unknown

["Benjamin Reed (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-822?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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