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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