Github user henryr commented on the issue: https://github.com/apache/spark/pull/20254 Thanks all for the pointers and feedback! I've removed the references to the behavior before 2.0, and now the changes just make it explicit that this is `EXCEPT DISTINCT` (I appreciate that that's the meaning of `EXCEPT` per ANSI, but the behavior change since 1.x has confused users I've spoken to so seems worthwhile to make the documentation as clear as possible).
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