zhongjiajie commented on pull request #8231:
URL: https://github.com/apache/airflow/pull/8231#issuecomment-654326927


   I think this patch could be accept. In L1529, we delete all tag in dag and 
in L1532 we create all new tag object and add all of them to `dag_tag` table. 
And this patch just remove not exists tag and add not exists one. So 
   the database query are the same(IMO), link 
https://github.com/apache/airflow/pull/8231#issuecomment-613395942 .
   
   BTW, `pytest --trace-sql=num,sql,parameters --capture=no` are the good tool 
and more easier to use. good job @mik-laj 


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