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https://issues.apache.org/jira/browse/PIG-863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12723683#action_12723683
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Dmitriy V. Ryaboy commented on PIG-863:
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I believe PIG-832  addresses this 

> Function (UDF) automatic namespace resolution is really needed
> --------------------------------------------------------------
>
>                 Key: PIG-863
>                 URL: https://issues.apache.org/jira/browse/PIG-863
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: David Ciemiewicz
>
> The Apache PiggyBank documentation says that to reference a function, I need 
> to specify a function as:
> org.apache.pig.piggybank.evaluation.string.UPPER(text)
> As in the example:
> {code}
> REGISTER /public/share/pig/contrib/piggybank/java/piggybank.jar ;
> TweetsInaug  = FILTER Tweets BY 
> org.apache.pig.piggybank.evaluation.string.UPPER(text) MATCHES 
> '.*(INAUG|OBAMA|BIDEN|CHENEY|BUSH).*' ;
> {code}
> Why can't we implement automatic name space resolution as so we can just 
> reference UPPER without namespace qualifiers?
> {code}
> REGISTER /public/share/pig/contrib/piggybank/java/piggybank.jar ;
> TweetsInaug  = FILTER Tweets BY UPPER(text) MATCHES 
> '.*(INAUG|OBAMA|BIDEN|CHENEY|BUSH).*' ;
> {code}
> I know about the workaround:
> {code}
> define org.apache.pig.piggybank.evaluation.string.UPPER UPPER
> {code}
> But this is really a pain to do if I have lots of functions.
> Just warn if there is a collision and suggest I use the "define" workaround 
> in the warning messages.

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