User comparator does not work if the comapre function is not in pig.jar
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                 Key: PIG-61
                 URL: https://issues.apache.org/jira/browse/PIG-61
             Project: Pig
          Issue Type: Bug
            Reporter: Olga Natkovich
            Assignee: Alan Gates


>From what I can tell, comparison function lookup does not interact with 
>register command. Instead, it expects to find the function on the class path. 
>The problem with that is that we don't ship jar that are not registered and 
>the registered jars don't get placed in classpath on the server path. The 
>solution should be to use the same way to instanciate the object as used for 
>other udfs.

Comparator: Class.forName
Other UDFs: PigContext.resolveClassName

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