Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/20594
I thought again, instead of "removing default value and restore it again
later (which may cause some side effects)", maybe the better way is, add a
parameter to `DefaultParamsWriter.saveMetadata`, specify which default param
need to skip when saving.
@mgaido91 Yes I agree with you. Either #20410 or #18982 need to be merged
to 2.3, the related issue is possible to cause some strange bugs.
cc @jkbradley
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