ashb commented on a change in pull request #21641:
URL: https://github.com/apache/airflow/pull/21641#discussion_r808984085



##########
File path: airflow/decorators/base.py
##########
@@ -269,22 +276,21 @@ def __call__(self, *args, **kwargs) -> XComArg:
             op.doc_md = self.function.__doc__
         return XComArg(op)
 
-    def _validate_arg_names(self, funcname: str, kwargs: Dict[str, Any], 
valid_names: Set[str] = set()):
-        unknown_args = kwargs.copy()
-        for name in itertools.chain(self.function_arg_names, valid_names):
-            unknown_args.pop(name, None)
-
-            if not unknown_args:
-                # If we have no args left ot check, we are valid
-                return
+    def _validate_arg_names(self, func: ValidationSource, kwargs: Dict[str, 
Any]):
+        kwargs_left = kwargs.copy()
+        for arg_name in self.function_arg_names:
+            value = kwargs_left.pop(arg_name, NOTSET)
+            if func != "map" or value is NOTSET or isinstance(value, 
get_mappable_types()):
+                continue
+            raise ValueError(f"{func} got unexpected value{type(value)!r} for 
keyword argument {arg_name!r}")

Review comment:
       🤦🏻 I see. Ignore me.




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