Github user srowen commented on the issue:

    https://github.com/apache/spark/pull/18899
  
    The new method is private. Certainly the user is not intended to call it 
and supply nnz. This change shouldn't alter any semantics or functionality. 
It's just trying to avoid calculating nnz twice: to figure out if the vector is 
sparse, and then to convert it to sparse.


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