Github user grzegorz-chilkiewicz commented on the pull request:
https://github.com/apache/spark/pull/11216#issuecomment-187610489
OK, I'll prepare that test soon.
I've checked that with even degree 0, PolynomialExpansion works (and
returns '0-length vector').
Does it make sense to extend range of legal parameters to gtEq(0) ?
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