PERFORMANCE: Use specialized POForEachNoFlatten for cases where the foreach has 
no flattens

                 Key: PIG-651
             Project: Pig
          Issue Type: Improvement
    Affects Versions: types_branch
            Reporter: Pradeep Kamath
            Assignee: Pradeep Kamath
             Fix For: types_branch

POForEach has lot of code to handle flattening (cross product) of the fields in 
the generate. This is relevant only when atleast one field in the generate 
needs to be flattened. If all fields in the generate do not need to be 
flattened, a more simplified and hopefully more efficient POForEach can be used.

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