PERFORMANCE: streaming data to the UDFs in foreach

                 Key: PIG-844
             Project: Pig
          Issue Type: Improvement
            Reporter: Olga Natkovich

Currently, Pig places the data passed to UDFs into a bag. This can cause the 
process to use more memory than actually needed as in many cases it would be 
better to push the data one tuple at a time to the UDFs.

For the case where combiner is invoked, this might not be that important; 
however, for non-algebraic UDFs as well as other cases where combiner can't be 
used, this can provide significant memory improvement.

Another possible use case is where the data is already grouped going into pig 
and we don't need to group it again.

How this will effect UDF interface needs to be further discussed.

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