Matthias Boehm created SYSTEMML-1754:

             Summary: Performance removeEmpty w/ shallow copy if unmodified
                 Key: SYSTEMML-1754
             Project: SystemML
          Issue Type: Task
            Reporter: Matthias Boehm

Often removeEmpty is used to guard against special cases with entirely empty 
rows or columns. In case of no removed rows or columns the full copy into the 
output is unnecessarily inefficient. This task aims to modify removeEmpty 
rows/cols for both dense and sparse matrices to leverage a shallow copy if 
determined output dimensions match the input dimensions.

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