[GitHub] [airflow] kaxil commented on a change in pull request #20931: Set dependencies in MappedOperator via XComArgs

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

kaxil commented on a change in pull request #20931:
URL: https://github.com/apache/airflow/pull/20931#discussion_r787606435



##########
File path: airflow/models/xcom_arg.py
##########
@@ -59,9 +61,9 @@ class XComArg(DependencyMixin):
     :type key: str
     """
 
-    def __init__(self, operator: Union[BaseOperator, MappedOperator], key: str = XCOM_RETURN_KEY):
-        self._operator = operator
-        self._key = key
+    def __init__(self, operator: "Union[BaseOperator, MappedOperator]", key: str = XCOM_RETURN_KEY):

Review comment:
       ```suggestion
       def __init__(self, operator: Union[BaseOperator, MappedOperator], key: str = XCOM_RETURN_KEY):
   ```
   
   Any reason for this change?




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