houqp edited a comment on pull request #11621:
URL: https://github.com/apache/airflow/pull/11621#issuecomment-749771427


   I have isolated this to the `execute` function in `MySQLdb/cursors.py`, it 
calls `db.literal` on query args, which evaluates enum value 
`DagRunType.SCHEDULED` to `'DagRunType.SCHEDULED'`. So looks like we can't 
guarantee consistent enum type handling behaviors between db drivers.
   
   relavent code: 
https://github.com/PyMySQL/mysqlclient/blob/ca630c01fb39f252a4c91a525e440beea4ac4447/MySQLdb/connections.py#L288
   
https://github.com/PyMySQL/mysqlclient/blob/ca630c01fb39f252a4c91a525e440beea4ac4447/MySQLdb/converters.py#L106
   https://github.com/PyMySQL/mysqlclient/blob/master/MySQLdb/_mysql.c#L1027
   


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