Method self_group

lib/sqlalchemy/sql/elements.py:643–670

Apply a 'grouping' to this :class:`_expression.ClauseElement`. This method is overridden by subclasses to return a "grouping" construct, i.e. parenthesis. In particular it's used by "binary" expressions to provide a grouping around themselves when placed into a lar

(
        self, against: Optional[OperatorType] = None
    )

        return traversals.compare(self, other, **kw)

    def self_group(
        self, against: Optional[OperatorType] = None
    ) -> ClauseElement:
        """Apply a 'grouping' to this :class:`_expression.ClauseElement`.

        This method is overridden by subclasses to return a "grouping"
        construct, i.e. parenthesis.   In particular it's used by "binary"
        expressions to provide a grouping around themselves when placed into a
        larger expression, as well as by :func:`_expression.select`
        constructs when placed into the FROM clause of another
        :func:`_expression.select`.  (Note that subqueries should be
        normally created using the :meth:`_expression.Select.alias` method,
        as many
        platforms require nested SELECT statements to be named).

        As expressions are composed together, the application of
        :meth:`self_group` is automatic - end-user code should never
        need to use this method directly.  Note that SQLAlchemy's
        clause constructs take operator precedence into account -
        so parenthesis might not be needed, for example, in
        an expression like ``x OR (y AND z)`` - AND takes precedence
        over OR.

        The base :meth:`self_group` method of
        :class:`_expression.ClauseElement`
        just returns self.
        """
        return self

    def _ungroup(self) -> ClauseElement:
        """Return this :class:`_expression.ClauseElement`