Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/11617#issuecomment-195258085
Returning a value by modifying an arg in place is exceptional, but I don't
think it's something that can never happen. This is a case where it should, and
it's done and documented in this special-purpose implementation intentionally
for performance. I don't know about you, but around BLAS/lapack and related
methods is exactly where I expect the function args to be modified, since
that's the only way lapack works.
Ideally, the modifying in-place semantics is reusable for a bunch of
purposes. Since it's just the result of the lapack call, I suspect it could be.
However that doesn't mean it's suitable for your use case. But if your solution
is to clone for all calls, then a solution for this particular other usage is
to pass a clone of your argument, yeah.
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