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https://issues.apache.org/jira/browse/PIG-822?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Olga Natkovich resolved PIG-822.
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Resolution: Fixed
ben updated the docs and they have been committed. Will be coming out as part
of Pig 0.4.0 release
> 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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