Method _insert_col_impl

lib/sqlalchemy/sql/selectable.py:3251–3264

(
        self,
        c: ColumnClause[Any],
        *,
        index: Optional[int] = None,
    )

        return self.name

    def _insert_col_impl(
        self,
        c: ColumnClause[Any],
        *,
        index: Optional[int] = None,
    ) -> None:
        existing = c.table
        if existing is not None and existing is not self:
            raise exc.ArgumentError(
                "column object '%s' already assigned to table '%s'"
                % (c.key, existing)
            )
        self._columns.add(c, index=index)
        c.table = self

    def append_column(self, column: ColumnClause[Any]) -> None:
        """Append a :class:`.ColumnClause` to this :class:`.TableClause`."""