Github user MaxGekk commented on the issue:
https://github.com/apache/spark/pull/21254
> Do we have any behavior change after the previous PR: #20937?
The PR brought the `encoding` (and `charset`) option but we didn't change
behavior when `encoding` is not specified.
As @HyukjinKwon wrote above the PR #21247 eliminates restrictions in write
but the restrictions don't break previous behavior (before #20937) in any case.
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