XD-DENG commented on issue #4504: [AIRFLOW-3690] Fix 
api.common.experimental.mark_tasks.set_state for manually-triggered DAG Runs
URL: https://github.com/apache/airflow/pull/4504#issuecomment-453831934
 
 
   Hi @kaxil , supplementary information: when you try to repeat my Step-3, you 
may see the line below in your webserver log:
   ```
   
/Users/XD/anaconda3/envs/airflow_env/lib/python3.5/site-packages/sqlalchemy/sql/default_comparator.py:161:
   SAWarning: The IN-predicate on "task_instance.execution_date" was invoked 
with an empty sequence.
    This results in a contradiction, which nonetheless can be expensive to 
evaluate. 
   Consider alternative strategies for improved performance.
   
     'strategies for improved performance.' % expr)
   ```
   
   This was also one of the clues I used to trouble-shoot this.

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