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https://issues.apache.org/jira/browse/PIG-1867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12998570#comment-12998570
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Alan Gates commented on PIG-1867:
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Pig already offers this. Have your UDF return a bag. You can then use flatten
to iterate through that bag.
> Allow UDFs that can generate multiple output tuples from a single input tuple
> -----------------------------------------------------------------------------
>
> Key: PIG-1867
> URL: https://issues.apache.org/jira/browse/PIG-1867
> Project: Pig
> Issue Type: New Feature
> Reporter: Mathias Herberts
>
> Hive offers this kind of thing using UDTF (User Defined Table generating
> Functions), it would be very useful for Pig to offer something similar, thus
> allowing more complex processing.
> One example of such use could be an n-gram generating function.
> I guess EvalFunc could be adapted/morped so exec returns an Iterator<T>
> instead of T.
> In a first approach, the iterator scanning could be restricted to cases when
> the UDF is used alone in a generate clause.
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