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    * ``identity_key(instance=instance)``

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        >>> row = engine.execute(text("select * from table where a=1 and b=2")).first()
        >>> identity_key(MyClass, row=row)
        (<class '__main__.MyClass'>, (1, 2), None)

      :param class: mapped class (must be a positional argument)
      :param row: :class:`.Row` row returned by a :class:`_engine.CursorResult`
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    real :class:`~sqlalchemy.sql.expression.Alias` object.

    A primary purpose of :class:`.AliasedClass` is to serve as an alternate
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    mapped entity can be used in multiple contexts.   A simple example::

        # find all pairs of users with the same name
        user_alias = aliased(User)
        session.query(User, user_alias).join(
            (user_alias, User.id > user_alias.id)
        ).filter(User.name == user_alias.name)

    :class:`.AliasedClass` is also capable of mapping an existing mapped
    class to an entirely new selectable, provided this selectable is column-
    compatible with the existing mapped selectable, and it can also be
    configured in a mapping as the target of a :func:`_orm.relationship`.
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    The :class:`.AliasedClass` object is constructed typically using the
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    The resulting object is an instance of :class:`.AliasedClass`.
    This object implements an attribute scheme which produces the
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    class, allowing :class:`.AliasedClass` to be compatible
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    including hybrid attributes (see :ref:`hybrids_toplevel`).

    The :class:`.AliasedClass` can be inspected for its underlying
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        from sqlalchemy import inspect

        my_alias = aliased(MyClass)
        insp = inspect(my_alias)

    The resulting inspection object is an instance of :class:`.AliasedInsp`.


    .. seealso::

        :func:`.aliased`

        :func:`.with_polymorphic`

        :ref:`relationship_aliased_class`

        :ref:`relationship_to_window_function`


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    * ``polymorphic_on`` - an alternate column or SQL expression which
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            class DictBundle(Bundle):
                def create_row_processor(self, query, procs, labels):
                    "Override create_row_processor to return values as dictionaries"

                    def proc(row):
                        return dict(zip(labels, (proc(row) for proc in procs)))

                    return proc

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