XD-DENG opened a new pull request #4023: [AIRFLOW-XXX] Refine Docstring for SQL Operators URL: https://github.com/apache/incubator-airflow/pull/4023 ### Description - [x] Here are some details about my PR, including screenshots of any UI changes: There SQL operators (based on `DbApiHook`) receive `sql` and `parameters` (optional) as arguments. But `parameters` were not documented. The contents I added is based on the docstring in https://github.com/apache/incubator-airflow/blob/master/airflow/hooks/dbapi_hook.py#L88
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