Fokko commented on code in PR #6342:
URL: https://github.com/apache/iceberg/pull/6342#discussion_r1045589430


##########
python/pyiceberg/schema.py:
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@@ -317,6 +331,97 @@ def primitive(self, primitive: PrimitiveType) -> T:
         """Visit a PrimitiveType"""
 
 
+class SchemaVisitorPerPrimitiveType(SchemaVisitor[T], ABC):
+    def primitive(self, primitive: PrimitiveType) -> T:
+        """Visit a PrimitiveType"""
+        if isinstance(primitive, FixedType):

Review Comment:
   It should be roughly equivalent, the `isinstance` checks are not that 
expensive. The main reason to go this route is that we can just OOP to call the 
right method, and you can't override a `singledistpatchmethod` method, it will 
still call the one on the base class.



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