Improving memory efficiency of Tuple implementation

                 Key: PIG-793
             Project: Pig
          Issue Type: Improvement
            Reporter: Olga Natkovich

Currently, our tuple is a real pig and uses a lot of extra memory. 

There are several places where we can improve memory efficiency:

(1) Laying out memory for the fields rather than using java objects since since 
each object for a numeric field takes 16 bytes
(2) For the cases where we know the schema using Java arrays rather than 

There might be more.

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