Github user marmbrus commented on the issue:

    https://github.com/apache/spark/pull/15918
  
    I don't think you can limit the implicit.  What type would pick up case 
classes, but not case classes that contain invalid things? I think you would 
need a macros for this kind of introspection.  (I'd be happy to be proven wrong 
with a PR.)
    
    I'd recommend you only import the implicits you need rather than using the 
wildcard.


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