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