Method _consider_from

lib/sqlalchemy/sql/dml.py:226–234

(
            from_: FromClause, include_surface_selectables: bool = False
        )

        seen = {primary_table}

        def _consider_from(
            from_: FromClause, include_surface_selectables: bool = False
        ) -> None:
            if not seen.intersection(from_._cloned_set):
                froms.append(from_)
            seen.update(from_._cloned_set)
            if include_surface_selectables:
                for elem in sql_util.surface_selectables_only(from_):
                    seen.update(elem._cloned_set)

        for from_ in explicit_froms:
            _consider_from(from_, include_surface_selectables=True)