Github user srowen commented on the issue:
https://github.com/apache/spark/pull/16149
What you have is fine (though I might name it `ylogy` or something). I
don't see other places in the code that compute x ln x or something similar, so
it's OK to make this a private function. You might just make a `private def` of
a local helper method rather than instantiate a lambda, but the difference is
trivial.
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