xuanyuanking commented on pull request #30344:
URL: https://github.com/apache/spark/pull/30344#issuecomment-725800383


   Thanks for the quick response @HyukjinKwon @HeartSaVioR 
   Yes, I volunteer to take some time investigating the Mima error as I 
mentioned in the comment. The `DirectAbstractMethodProblem` happens when the 
old method is concrete but the new one is deferred. 
   
https://github.com/lightbend/mima/blob/f25269a43ca3c19d0b587f61d33655eeddb888aa/core/src/main/scala/com/typesafe/tools/mima/lib/analyze/method/MethodChecker.scala#L56-L57
   So it should be a Mima friendly fix then.


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