alamb commented on issue #14247:
URL: https://github.com/apache/datafusion/issues/14247#issuecomment-2612213307

   > Using Field directly doesn't yet answer the question "how to interpret 
given field".
   
   I agree -- but at least it makes it possible to get the info
   
   >  So we gonna have a helper function that takes a Field and returns... "the 
type object" representing the type of that field -- either arrow DataType or 
extension.
   
   If the goal is to have implementation of extension types in the core of 
datafusion,  I agree with this statement and that is an excellent point.
   
   However, in my mind the goal is actually to have almost no specific 
extension type support in DataFusion itself, but instead have all the 
implementations live elsewhere (e.g. all geospatial packages live in some other 
repo, and there is no geospatial knowledge in the core of DataFusion)
   
   
   


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