[GitHub] [arrow] jorisvandenbossche commented on a diff in pull request #14238: ARROW-17813: [Python] Nested ExtensionArray conversion to/from pandas/numpy

[GitBox <gi...@apache.org>]

jorisvandenbossche commented on code in PR #14238:
URL: https://github.com/apache/arrow/pull/14238#discussion_r992250647


##########
python/pyarrow/tests/test_extension_type.py:
##########
@@ -60,6 +60,22 @@ def __reduce__(self):
         return UuidType, ()
 
 
+class LabelType(pa.ExtensionType):
+
+    def __init__(self):
+        super(LabelType, self).__init__(pa.string(), "label")
+
+    def __reduce__(self):
+        return LabelType, ()
+
+    def __arrow_ext_serialize__(self):
+        return b""
+
+    @classmethod
+    def __arrow_ext_deserialize__(cls, storage_type, serialized):
+        return LabelType()

Review Comment:
   ```suggestion
   class LabelType(pa.PyExtensionType):
   
       def __init__(self):
           pa.PyExtensionType.__init__(self, pa.string())
   
       def __reduce__(self):
           return LabelType, ()
   ```



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