Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/21721 I actually thought those all of them are part of DataSource V2. Why are we fine with changing those interfaces but not okay with this one and we consider reverting it? Other things should be clarified if there are some concerns, yea of course. In this case, switching it to `Unstable` looks alleviating the concerns listed here enough.
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