PERFORMANCE: enable combiner to be called 0 or more times whenver the combiner 
is used for a pig query

                 Key: PIG-563
             Project: Pig
          Issue Type: Improvement
    Affects Versions: types_branch
            Reporter: Pradeep Kamath
            Assignee: Pradeep Kamath
             Fix For: types_branch

Currently Pig's use of the combiner assumes the combiner is called exactly once 
in Hadoop. With Hadoop 18, the combiner could be called 0, 1 or more times. 
This issue is to track changes needed in the CombinerOptimizer visitor and the 
builtin Algebraic UDFS (SUM, COUNT, MIN, MAX, AVG) to be able to work in this 
new model.

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