uranusjr commented on a change in pull request #21641:
URL: https://github.com/apache/airflow/pull/21641#discussion_r809008757



##########
File path: airflow/models/abstractoperator.py
##########
@@ -17,14 +17,18 @@
 # under the License.
 
 import datetime
-from typing import TYPE_CHECKING, Any, Callable, Collection, Dict, List, 
Optional, Set, Type, Union
+from typing import TYPE_CHECKING, Any, Callable, Collection, Dict, Iterable, 
List, Optional, Set, Type, Union
+
+from sqlalchemy.orm import Session

Review comment:
       Yes, but if `Session` is ever passed in as an argument this class is 
already in memory anyway, making this import basically free.




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