Explain how different UDF interfaces are used
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                 Key: PIG-1613
                 URL: https://issues.apache.org/jira/browse/PIG-1613
             Project: Pig
          Issue Type: Improvement
          Components: documentation
    Affects Versions: 0.7.0
            Reporter: Olga Natkovich
            Assignee: Corinne Chandel
             Fix For: 0.8.0


The current documentation describes individual UDF interfaces such as Algebraic 
and Accumulator but not their precedence or how they interact with each other 
and why you might want to implement several of them.

Corrine, I will add release notes to this JIRA shortly. Don't worry about it 
till then.

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