Check the existence of _fields instead of __annotations__ for NamedTuple.

yilei · yilei · commit 9fcabc6586e8 · 2025-09-30T19:30:34.000-07:00
diff --git a/sdks/python/apache_beam/typehints/native_type_compatibility.py b/sdks/python/apache_beam/typehints/native_type_compatibility.py
@@ -164,7 +164,7 @@ def _match_is_exactly_sequence(user_type):
 def match_is_named_tuple(user_type):
   return (
       _safe_issubclass(user_type, typing.Tuple) and
-      hasattr(user_type, '__annotations__'))
+      hasattr(user_type, '_fields'))
 
 
 def _match_is_optional(user_type):
