Github user srowen commented on the issue:
https://github.com/apache/spark/pull/18645
@rxin it's definitely breaking between Scala 2.11 and Scala 2.12, but not
for the Scala 2.11 build. Ideally, we find it's possible to enable a 2.12
build, such that the changes are binary and source compatible within the Scala
2.11 builds. Otherwise, it'd be impossible to merge this before 3.0.0. But if
it doesn't affect 2.11 users there's a much better argument for adding the
build in a minor release, as Scala versions have never been mutually
compatible.
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