Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/11617#issuecomment-194713989
Certainly, the lapack methods modify their arguments in order to return a
value. That's by design of course. And the javadoc for this method indicates
that the `solve()` method also intends to modify its args in place. Your tests
show this is required. This isn't a bug then.
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