timsaucer commented on PR #22368:
URL: https://github.com/apache/datafusion/pull/22368#issuecomment-4499677132

   > I understand the reasoning here and can't see what cases this breaks.
   > 
   
   It's in the linked issue, but we have cases where via FFI we have things 
like a `Column` that can't be downcast because they live on the other side of 
the FFI boundary so they have a wrapper. We're going to do other changes to 
make those well known types parse differently, but that's the case that caught 
this issue.


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