Method visit_label_reference

lib/sqlalchemy/sql/compiler.py:2522–2567

(
        self, element, within_columns_clause=False, **kwargs
    )

        return "(" + grouping.element._compiler_dispatch(self, **kwargs) + ")"

    def visit_label_reference(
        self, element, within_columns_clause=False, **kwargs
    ):
        if self.stack and self.dialect.supports_simple_order_by_label:
            try:
                compile_state = cast(
                    "Union[SelectState, CompoundSelectState]",
                    self.stack[-1]["compile_state"],
                )
            except KeyError as ke:
                raise exc.CompileError(
                    "Can't resolve label reference for ORDER BY / "
                    "GROUP BY / DISTINCT etc."
                ) from ke

            (
                with_cols,
                only_froms,
                only_cols,
            ) = compile_state._label_resolve_dict
            if within_columns_clause:
                resolve_dict = only_froms
            else:
                resolve_dict = only_cols

            # this can be None in the case that a _label_reference()
            # were subject to a replacement operation, in which case
            # the replacement of the Label element may have changed
            # to something else like a ColumnClause expression.
            order_by_elem = element.element._order_by_label_element

            if (
                order_by_elem is not None
                and order_by_elem.name in resolve_dict
                and order_by_elem.shares_lineage(
                    resolve_dict[order_by_elem.name]
                )
            ):
                kwargs["render_label_as_label"] = (
                    element.element._order_by_label_element
                )
        return self.process(
            element.element,
            within_columns_clause=within_columns_clause,
            **kwargs,
        )

    def visit_textual_label_reference(
        self, element, within_columns_clause=False, **kwargs