Github user rahulpalamuttam commented on the pull request:

    https://github.com/apache/spark/pull/8960#issuecomment-168925236
  
    Also on a related point to what I had here: using activeIte SparseMatrix 
equality only works when both matrices are Sparse. Breeze does not provide a 
numNonZero method and using it defeats the purpose of an "optimal" SparseMatrix 
equality. This is because it iterates through 


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