uranusjr opened a new pull request, #47089:
URL: https://github.com/apache/airflow/pull/47089

   We can save one more round trip to the database by a subquery to the dag 
table. I also used `has()` and `any()` to replace `select(1)` calls. The effect 
is exactly the same, but the code is automatically shorter.
   
   
https://docs.sqlalchemy.org/en/20/orm/queryguide/select.html#exists-forms-has-any


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