Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/21732
Since we have to handle some special cases, can you list them in the PR
description?
For `Product`, normally it should be a struct type column, the special case
I can think of is: 1) at root level, flatten it into multiple columns, and the
`Product` can't be null.
For `Option[Product]`, normally it should also be a struct type column,
seems there is no special case.
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