uranusjr commented on pull request #20975:
URL: https://github.com/apache/airflow/pull/20975#issuecomment-1021798682
Oh no
```
self = <_mysql.connection open to 'mysql' at 0x55ac746f4270>, query =
b'ALTER TABLE __airflow_tmp_xcom ADD CONSTRAINT xcom_pkey PRIMARY KEY (`key`,
dag_id, task_id, run_id)'
def query(self, query):
# Since _mysql releases GIL while querying, we need immutable buffer.
if isinstance(query, bytearray):
query = bytes(query)
> _mysql.connection.query(self, query)
E sqlalchemy.exc.OperationalError:
(MySQLdb._exceptions.OperationalError) (1071, 'Specified key was too long; max
key length is 3072 bytes')
E [SQL: ALTER TABLE __airflow_tmp_xcom ADD CONSTRAINT xcom_pkey
PRIMARY KEY (`key`, dag_id, task_id, run_id)]
E (Background on this error at: http://sqlalche.me/e/13/e3q8)
```
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