Method _construct_for_op

lib/sqlalchemy/sql/elements.py:3154–3198

(
        cls,
        left: ColumnElement[Any],
        right: ColumnElement[Any],
        op: OperatorType,
        *,
        type_: TypeEngine[_T],
        negate: Optional[OperatorType] = None,
        modifiers: Optional[Mapping[str, Any]] = None,
    )

    @classmethod
    def _construct_for_op(
        cls,
        left: ColumnElement[Any],
        right: ColumnElement[Any],
        op: OperatorType,
        *,
        type_: TypeEngine[_T],
        negate: Optional[OperatorType] = None,
        modifiers: Optional[Mapping[str, Any]] = None,
    ) -> OperatorExpression[_T]:
        if operators.is_associative(op):
            assert (
                negate is None
            ), f"negate not supported for associative operator {op}"

            multi = False
            if getattr(
                left, "operator", None
            ) is op and type_._compare_type_affinity(left.type):
                multi = True
                left_flattened = left._flattened_operator_clauses
            else:
                left_flattened = (left,)

            if getattr(
                right, "operator", None
            ) is op and type_._compare_type_affinity(right.type):
                multi = True
                right_flattened = right._flattened_operator_clauses
            else:
                right_flattened = (right,)

            if multi:
                return ExpressionClauseList._construct_for_list(
                    op,
                    type_,
                    *(left_flattened + right_flattened),
                )

        if left._is_collection_aggregate or right._is_collection_aggregate:
            negate = None

        return BinaryExpression(
            left, right, op, type_=type_, negate=negate, modifiers=modifiers
        )


class ExpressionClauseList(OperatorExpression[_T]):