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From "Nicholas Verbeck (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-2929) CONCAT returns null when 1 items is null
Date Thu, 27 Sep 2012 17:20:07 GMT

    [ https://issues.apache.org/jira/browse/PIG-2929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13464885#comment-13464885
] 

Nicholas Verbeck commented on PIG-2929:
---------------------------------------

This all makes since. The addition of comments was more the main goal I was looking for. Just
to prevent anyone else from having the assumptions I had.

However I did managed to solve the issue without a UDF by leveraging the ternary operations.
ie. CONCAT(domain is null?"":domain, path is null?"":path). The case I had was concating parts
of a URL back together. Where the Query String might be null if there wasn't one.
                
> CONCAT returns null when 1 items is null
> ----------------------------------------
>
>                 Key: PIG-2929
>                 URL: https://issues.apache.org/jira/browse/PIG-2929
>             Project: Pig
>          Issue Type: Bug
>          Components: documentation, internal-udfs
>    Affects Versions: 0.9.0, 0.9.1, 0.9.2
>            Reporter: Nicholas Verbeck
>            Assignee: Cheolsoo Park
>             Fix For: 0.11
>
>         Attachments: PIG-2929.patch
>
>
> Just stumbled upon this issue over the weekend. It appears the built-in CONCAT function
will return null in the advent of 1 item in the Tuple being null. If this is as intended it
would be nice if the docs made note of this. Otherwise it would be nice if nulls where just
skipped and a proper string of what was left was returned. If all items are null then just
return null in that case.

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