Handling of NULL in Pig builtin functions needs to be reviewed

                 Key: PIG-709
                 URL: https://issues.apache.org/jira/browse/PIG-709
             Project: Pig
          Issue Type: Bug
          Components: impl
            Reporter: Santhosh Srinivasan

Pig builtin functions do not handle NULL consistently. Some examples are the 
combiner versus non-combiner for AVG. All the builtins need a review of cases 
where NULL is handled.

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