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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1606) flatten documentation does not discuss flatten of empty bag
Date Sat, 11 Sep 2010 01:08:33 GMT

    [ https://issues.apache.org/jira/browse/PIG-1606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12908259#action_12908259
] 

Alan Gates commented on PIG-1606:
---------------------------------

flatten of an empty bag has to be a black hole else cogroup + foreach != inner join, which
we claim it does.

> 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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