Method _ifnone

lib/sqlalchemy/sql/elements.py:2898–2904

(
        cls, other: Optional[ColumnElement[Any]]
    )

    @classmethod
    def _ifnone(
        cls, other: Optional[ColumnElement[Any]]
    ) -> ColumnElement[Any]:
        if other is None:
            return cls._instance()
        else:
            return other

    @classmethod
    def _instance(cls) -> True_: