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https://issues.apache.org/jira/browse/PIG-1606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12908250#action_12908250
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Olga Natkovich commented on PIG-1606:
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Is this even the semantics we want. I would expect a single row with an empty
field.
> flatten documentation does not discuss flatten of empty bag
> -----------------------------------------------------------
>
> Key: PIG-1606
> URL: https://issues.apache.org/jira/browse/PIG-1606
> Project: Pig
> Issue Type: Bug
> Components: documentation
> Reporter: Thejas M Nair
> Fix For: 0.9.0
>
>
> From the existing flatten documentation, it is not clear that flatten of an
> empty bag results in that row being discarded .
> For example the following query gives no output -
> {code}
> grunt> cat /tmp/empty.bag
> {} 1
> grunt> l = load '/tmp/empty.bag' as (b : bag{}, i : int);
> grunt> f = foreach l generate flatten(b), i;
> grunt> dump f;
> grunt>
> {code}
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