srowen commented on pull request #28663:
URL: https://github.com/apache/spark/pull/28663#issuecomment-637017978


   Yeah the only downside is that if we fill the migration guide with a bunch 
of niche stuff, it might be hard to figure out what the important common items 
are. I'm not sure how much user code uses the mixins directly, but if there is 
any code that does it's probably something like `HasOutputCols`, a common one. 
So yeah I think it's OK to mention this change.


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