Github user markhamstra commented on the issue: https://github.com/apache/spark/pull/21598 @HyukjinKwon this is not new policy. It is what Apache Spark has guaranteed in its version numbering and public API since 1.0.0. It is not a matter of "from now on", but rather of whether committers have started allowing our standards to slip. It may well be time for a discussion of that and of better tools to help guarantee that additions and changes to the public API are adequately discussed and reviewed, appropriate InterfaceStability annotations are applied, etc.
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