Optimize execution of algebraic functions
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                 Key: PIG-7
                 URL: https://issues.apache.org/jira/browse/PIG-7
             Project: Pig
          Issue Type: Improvement
            Reporter: Olga Natkovich
            Assignee: Alan Gates


Algebraic are functions that can be computed incrementally like count(X), 
SUM(X), etc. They can be computed effciently by doing the first level 
computation using hadoop combiner. This can give a significant (2-3x) speedup 
for many aggregation queries. 

Several users asked us for this feature so it is pretty high priority.

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