<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 async def explain(self) -> Any: """Fetch and return information about the query execution plan. This is done by executing an ``EXPLAIN`` query whose exact prefix depends on the database backend, as documented below. .. note:: This is only meant to be used in an interactive environment for debugging and query optimization. **The output format may (and will) vary greatly depending on the database backend.** """

        if self._db is None:
            self._db = self.model._meta.db

        return await self._db.executor_class(model=self.model, db=self._db).execute_explain(
            self._make_query()
        )