Github user sethah commented on the issue:
https://github.com/apache/spark/pull/14834
@dbtsai Yeah, if we store it as a row major sparse matrix then the
`rowIndices` will exactly be the indices needed for the sparse vector. We'll
have to add some functionality to the linalg classes to accomplish this. I can
look into it. We can continue moving forward for this PR without it, and
address the `compressed` option later, but IMO it must be done before 2.1
release. Otherwise, we can block this PR until it is done.
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