fix: prefer sqlalchemy.type.impl if it exists (#502)

Author: cofin

polyfactory/factories/sqlalchemy_factory.py

@@ -126,7 +126,11 @@ def get_type_from_column(cls, column: Column) -> type:
         elif issubclass(column_type, types.ARRAY):
             annotation = List[column.type.item_type.python_type]  # type: ignore[assignment,name-defined]
         else:
-            annotation = column.type.python_type
+            annotation = (
+                column.type.impl.python_type  # pyright: ignore[reportGeneralTypeIssues]
+                if hasattr(column.type, "impl")
+                else column.type.python_type
+            )
 
         if column.nullable:
             annotation = Union[annotation, None]  # type: ignore[assignment]