Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/3997#issuecomment-69949365
@hhbyyh Although I don't wish to speak for @mengxr I strongly suspect he
would welcome you implementing the idea. I'm not sure we should use `sqdist`
since it looks like it doesn't require vectors of the same size, and that seems
essential for `equals` and `hashCode`? But I think it can indeed handle the
cases of sparse vs dense similarly and efficiently.
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