Performance: Unnnecessary computation in FRJoin

                 Key: PIG-865
             Project: Pig
          Issue Type: Improvement
          Components: impl
    Affects Versions: 0.3.0
            Reporter: Ashutosh Chauhan
            Priority: Minor
             Fix For: 0.4.0

In POFRJoin implementation POLocalRearrange is used to extract join keys from 
the input tuples. If keys match then to perform actual join input tuples are 
fed to Foreach which does a cross on its inputs. After keys are extracted using 
POLocalRearrange output; function getValueTuple(POLocalRearrange lr, Tuple 
tuple) is called to reconstruct the input tuple. It seems that this function 
call is unnecessary since we already have input tuple at that time. 

This is not a bug, but since this function would get called for every tuple, if 
it is eliminated, it should certainly help to improve performance. 

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