Github user rxin commented on the issue:
https://github.com/apache/spark/pull/15734
A lot of wrappers in Scala are slower even with JIT, e.g. at some point
Spark used Scala's StringBuffer and some user found it was 30% slower than
Java's. Anyway even if there is 0% performance difference, I don't think it is
that big of a deal to have some code using scala.math and some using java math.
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