Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/11216#issuecomment-187465371
The implementation should work with degree `1`, but we need to add a test
to show that. @grzegorz-chilkiewicz Could you update this PR and add a test to
show with degree 1 it is a no-op? Just testing the setter is not sufficient.
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