code: def column_names(self) -> Tuple[str, ...]:
      return tuple([col.name for col in self.const.columns])
  
imports: from __future__ import annotations
  from typing import Any
  from typing import ClassVar
  from typing import Dict
  from typing import Generic
  from typing import NamedTuple
  from typing import Optional
  from typing import Sequence
  from typing import Tuple
  from typing import Type
  from typing import TYPE_CHECKING
  from typing import TypeVar
  from typing import Union
  from sqlalchemy.sql.schema import Constraint
  from sqlalchemy.sql.schema import ForeignKeyConstraint
  from sqlalchemy.sql.schema import Index
  from sqlalchemy.sql.schema import UniqueConstraint
  from typing_extensions import TypeGuard
  from ..None import util
  from ..util import sqla_compat
label_desc: Use image node_id 5 for calling the _ix_constraint_sig obj's underlying member method code with example usage: obj.column_names() and returns: tuple