code: async def explain(self) -> Any:
          
          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()
          )
docs: 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.
  
          - PostgreSQL: ``EXPLAIN (FORMAT JSON, VERBOSE) ...``
          - SQLite: ``EXPLAIN QUERY PLAN ...``
          - MySQL: ``EXPLAIN FORMAT=JSON ...``
  
          .. 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.**