RussellSpitzer commented on code in PR #10955:
URL: https://github.com/apache/iceberg/pull/10955#discussion_r1767610889


##########
format/spec.md:
##########
@@ -174,6 +174,7 @@ Supported primitive types are defined in the table below. 
Primitive types added
 
 | Added by version | Primitive type     | Description                          
                                    | Requirements                              
       |
 
|------------------|--------------------|--------------------------------------------------------------------------|--------------------------------------------------|
+| [v3](#version-3) | **`unknown`**      | Default / null column type used when 
a more specific type is not known   | Must be optional with `null` defaults     
       |

Review Comment:
   I think I missed where this was proposed, do we have a doc anywhere 
explaining the use case for this?



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