What happens when an engine receives queries while it is in a stopped state?
If the engine has the AUTO_START option set to True, an engine in a stopped state will be automatically started when it receives a query. By default, this option is set to True. If this option is set to False, you must explicitly start the engine using the START ENGINE command. For more information, please refer to the Work with Engines Using DDL article in the Firebolt Documentation.