feng-tao commented on a change in pull request #3596: [AIRFLOW-2747] Explicit 
re-schedule of sensors
URL: https://github.com/apache/incubator-airflow/pull/3596#discussion_r218214762
 
 

 ##########
 File path: airflow/models.py
 ##########
 @@ -56,8 +56,8 @@
 
 from sqlalchemy import (
     Column, Integer, String, DateTime, Text, Boolean, ForeignKey, PickleType,
-    Index, Float, LargeBinary, UniqueConstraint)
-from sqlalchemy import func, or_, and_, true as sqltrue
+    Index, Float, LargeBinary, UniqueConstraint, ForeignKeyConstraint)
+from sqlalchemy import func, or_, and_, true as sqltrue, asc
 
 Review comment:
   how does line work(`import func, or_, and_, true as sqltrue, asc`) ? I 
wonder whether you want to do `from sqlalchemy import asc` instead?

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