Class _SentinelColumnCharacterization

lib/sqlalchemy/sql/base.py:1718–1724

class _SentinelColumnCharacterization(NamedTuple):
    columns: Optional[Sequence[Column[Any]]] = None
    is_explicit: bool = False
    is_autoinc: bool = False
    default_characterization: _SentinelDefaultCharacterization = (
        _SentinelDefaultCharacterization.NONE
    )


_COLKEY = TypeVar("_COLKEY", Union[None, str], str)