Github user viirya commented on the issue:
https://github.com/apache/spark/pull/17459
I've done some prototype locally to generalize this change to
`SparseMatrix`. During that, I have a thought that do we have the limit that
all Matrix in `BlockMatrix` need to be the same kind of Matrix (i.e.,
`DenseMatrix` or `SparseMatrix`)?
Actually we can easily have only one `toBlockMatrix` method which creates a
`BlockMatrix` including both `DenseMatrix` or `SparseMatrix`, depending if the
blocks are sparse or not.
From the external view of this API, we don't have an explicit difference
between `SparseMatrix`-backed and `DenseMatrix`-backed `BlockMatrix`s. We don't
have subclasses for it, nor any property can be used to know about it. Doesn't
it mean we don't really care about it?
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