Github user hhbyyh commented on the issue:
https://github.com/apache/spark/pull/19599
> One option that came to my mind was that $ returns lowercase, so this is
used at most places but when you really need it you can access the original
(not necessarily lowercase) value.
As in the previous commits of this PR, I tried to add a new `$lc` function
in trait `Params`, which works with Param[String] and return the lowercased
version. But that breaks the binary compatibility and I guess that's the
bigger evil.
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