Github user viirya commented on the issue:
https://github.com/apache/spark/pull/21732
> if we can totally hide the topLevel parameter from users, it should be
fine. Generally I think the behavior is consistent, now Option[Product] is
always a struct type column. But we need to improve the implementation to hide
the topLevel.
Sounds good. I'm wondering if there is good way to hide `topLevel`.
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