Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/3643#issuecomment-66342802
Hi, it looks like this may be faster for dense vectors but not for sparse.
SparseVector.toArray will create a dense vector, making it much slower if the
vector is very sparse. You will probably need separate cases for DenseVector
and SparseVector.
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