marmbrus commented on issue #23178: [SPARK-26216][SQL] Do not use case class as public API (UserDefinedFunction) URL: https://github.com/apache/spark/pull/23178#issuecomment-448365228 > Changing class to interface is not binary compatible(but source compatible), so 3.0 is a good chance to do it. Why not keep it an abstract class? This is going to break every application that uses UDFs, which while allowed at a major version, seems like a pretty big annoyance.
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