zhongjiajie commented on issue #7570: [AIRFLOW-6946] Switch to MySQL 5.7 in 2.0 as base URL: https://github.com/apache/airflow/pull/7570#issuecomment-604963676 @potiuk FYI, I still get ```sh sqlalchemy.exc.OperationalError: (_mysql_exceptions.OperationalError) (1071, 'Specified key was too long; max key length is 767 bytes') [SQL: ALTER TABLE xcom ADD CONSTRAINT pk_xcom PRIMARY KEY (dag_id, task_id, `key`, execution_date)] ``` in master, after I set `sql_engine_collation_for_ids = utf8mb3_general_ci`, in breeze with mysql 5.6 and python 3.7
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