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t�|	���|�g�gd��q�|�tj��fdd�|D��gd��q�Wtj|��|�S)a)Create a ``UNION`` statement used by a polymorphic mapper.

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    :param typecolname: string name of a "discriminator" column, which will be
     derived from the query, producing the polymorphic identity for
     each row.  If ``None``, no polymorphic discriminator is generated.
    :param aliasname: name of the :func:`~sqlalchemy.sql.expression.alias()`
     construct generated.
    :param cast_nulls: if True, non-existent columns, which are represented
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aGenerate "identity key" tuples, as are used as keys in the
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    This function has several call styles:

    * ``identity_key(class, ident, identity_token=token)``

      This form receives a mapped class and a primary key scalar or
      tuple as an argument.

      E.g.::

        >>> identity_key(MyClass, (1, 2))
        (<class '__main__.MyClass'>, (1, 2), None)

      :param class: mapped class (must be a positional argument)
      :param ident: primary key, may be a scalar or tuple argument.
      :param identity_token: optional identity token

        .. versionadded:: 1.2 added identity_token


    * ``identity_key(instance=instance)``

      This form will produce the identity key for a given instance.  The
      instance need not be persistent, only that its primary key attributes
      are populated (else the key will contain ``None`` for those missing
      values).

      E.g.::

        >>> instance = MyClass(1, 2)
        >>> identity_key(instance=instance)
        (<class '__main__.MyClass'>, (1, 2), None)

      In this form, the given instance is ultimately run though
      :meth:`.Mapper.identity_key_from_instance`, which will have the
      effect of performing a database check for the corresponding row
      if the object is expired.

      :param instance: object instance (must be given as a keyword arg)

    * ``identity_key(class, row=row, identity_token=token)``

      This form is similar to the class/tuple form, except is passed a
      database result row as a :class:`.RowProxy` object.

      E.g.::

        >>> row = engine.execute("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:`.RowProxy` row returned by a :class:`.ResultProxy`
       (must be given as a keyword arg)
      :param identity_token: optional identity token

        .. versionadded:: 1.2 added identity_token

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�Zdd�ZdS)�AliasedClassa�Represents an "aliased" form of a mapped class for usage with Query.

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    ``__getattr__`` scheme and maintains a reference to a
    real :class:`~sqlalchemy.sql.expression.Alias` object.

    A primary purpose of :class:`.AliasedClass` is to serve as an alternate
    within a SQL statement generated by the ORM, such that an existing
    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:`.relationship`.
    See the links below for examples.

    The :class:`.AliasedClass` object is constructed typically using the
    :func:`.orm.aliased` function.   It also is produced with additional
    configuration when using the :func:`.orm.with_polymorphic` function.

    The resulting object is an instance of :class:`.AliasedClass`.
    This object implements an attribute scheme which produces the
    same attribute and method interface as the original mapped
    class, allowing :class:`.AliasedClass` to be compatible
    with any attribute technique which works on the original class,
    including hybrid attributes (see :ref:`hybrids_toplevel`).

    The :class:`.AliasedClass` can be inspected for its underlying
    :class:`.Mapper`, aliased selectable, and other information
    using :func:`.inspect`::

        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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        from sqlalchemy import inspect
        from sqlalchemy.orm import aliased

        my_alias = aliased(MyMappedClass)
        insp = inspect(my_alias)

    Attributes on :class:`.AliasedInsp`
    include:

    * ``entity`` - the :class:`.AliasedClass` represented.
    * ``mapper`` - the :class:`.Mapper` mapping the underlying class.
    * ``selectable`` - the :class:`.Alias` construct which ultimately
      represents an aliased :class:`.Table` or :class:`.Select`
      construct.
    * ``name`` - the name of the alias.  Also is used as the attribute
      name when returned in a result tuple from :class:`.Query`.
    * ``with_polymorphic_mappers`` - collection of :class:`.Mapper` objects
      indicating all those mappers expressed in the select construct
      for the :class:`.AliasedClass`.
    * ``polymorphic_on`` - an alternate column or SQL expression which
      will be used as the "discriminator" for a polymorphic load.

    .. seealso::

        :ref:`inspection_toplevel`

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zAliasedInsp._memocCs<|jr"dd�dd�|jD��}nd}dt|�|jj|fS)Nz(%s)z, css|]}|jjVqdS)N)ryrD)r%�mpr#r#r'�	<genexpr>�sz'AliasedInsp.__repr__.<locals>.<genexpr>r@z<AliasedInsp at 0x%x; %s%s>)r�r1r�ryrD)r<Z	with_polyr#r#r'r>�szAliasedInsp.__repr__cs>�jr,d�jjd��fdd��jD��fSd�jjfSdS)Nzwith_polymorphic(%s, [%s])z, c3s |]}|�jk	r|jjVqdS)N)rzryrD)r%r�)r<r#r'r��sz&AliasedInsp.__str__.<locals>.<genexpr>zaliased(%s))r�r�rDr1r�)r<r#)r<r'r��s
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r�cCs|jS)N)r�)r�r#r#r'�<lambda>��r�cCs|S)Nr#)r�r#r#r'r��r�FcCs>t|tj�r(|rt�d��|j||d�St|||||d�SdS)agProduce an alias of the given element, usually an :class:`.AliasedClass`
    instance.

    E.g.::

        my_alias = aliased(MyClass)

        session.query(MyClass, my_alias).filter(MyClass.id > my_alias.id)

    The :func:`.aliased` function is used to create an ad-hoc mapping
    of a mapped class to a new selectable.  By default, a selectable
    is generated from the normally mapped selectable (typically a
    :class:`.Table`) using the :meth:`.FromClause.alias` method.
    However, :func:`.aliased` can also be used to link the class to
    a new :func:`.select` statement.   Also, the :func:`.with_polymorphic`
    function is a variant of :func:`.aliased` that is intended to specify
    a so-called "polymorphic selectable", that corresponds to the union
    of several joined-inheritance subclasses at once.

    For convenience, the :func:`.aliased` function also accepts plain
    :class:`.FromClause` constructs, such as a :class:`.Table` or
    :func:`.select` construct.   In those cases, the :meth:`.FromClause.alias`
    method is called on the object and the new :class:`.Alias` object
    returned.  The returned :class:`.Alias` is not ORM-mapped in this case.

    :param element: element to be aliased.  Is normally a mapped class,
     but for convenience can also be a :class:`.FromClause` element.

    :param alias: Optional selectable unit to map the element to.  This should
     normally be a :class:`.Alias` object corresponding to the :class:`.Table`
     to which the class is mapped, or to a :func:`.select` construct that
     is compatible with the mapping.   By default, a simple anonymous
     alias of the mapped table is generated.

    :param name: optional string name to use for the alias, if not specified
     by the ``alias`` parameter.  The name, among other things, forms the
     attribute name that will be accessible via tuples returned by a
     :class:`.Query` object.

    :param flat: Boolean, will be passed through to the
     :meth:`.FromClause.alias` call so that aliases of :class:`.Join` objects
     don't include an enclosing SELECT.  This can lead to more efficient
     queries in many circumstances.  A JOIN against a nested JOIN will be
     rewritten as a JOIN against an aliased SELECT subquery on backends that
     don't support this syntax.

     .. versionadded:: 0.9.0

     .. seealso:: :meth:`.Join.alias`

    :param adapt_on_names: if True, more liberal "matching" will be used when
     mapping the mapped columns of the ORM entity to those of the
     given selectable - a name-based match will be performed if the
     given selectable doesn't otherwise have a column that corresponds
     to one on the entity.  The use case for this is when associating
     an entity with some derived selectable such as one that uses
     aggregate functions::

        class UnitPrice(Base):
            __tablename__ = 'unit_price'
            ...
            unit_id = Column(Integer)
            price = Column(Numeric)

        aggregated_unit_price = Session.query(
                                    func.sum(UnitPrice.price).label('price')
                                ).group_by(UnitPrice.unit_id).subquery()

        aggregated_unit_price = aliased(UnitPrice,
                    alias=aggregated_unit_price, adapt_on_names=True)

     Above, functions on ``aggregated_unit_price`` which refer to
     ``.price`` will return the
     ``func.sum(UnitPrice.price).label('price')`` column, as it is
     matched on the name "price".  Ordinarily, the "price" function
     wouldn't have any "column correspondence" to the actual
     ``UnitPrice.price`` column as it is not a proxy of the original.

    z+adapt_on_names only applies to ORM elements)r�)rgr�rar�N)r)rZ
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�}|	j|||d�\}}|sj|rv|j	|d�}t
||||||d�S)a�Produce an :class:`.AliasedClass` construct which specifies
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    Using this method will ensure that each descendant mapper's
    tables are included in the FROM clause, and will allow filter()
    criterion to be used against those tables.  The resulting
    instances will also have those columns already loaded so that
    no "post fetch" of those columns will be required.

    .. seealso::

        :ref:`with_polymorphic` - full discussion of
        :func:`.orm.with_polymorphic`.

    :param base: Base class to be aliased.

    :param classes: a single class or mapper, or list of
        class/mappers, which inherit from the base class.
        Alternatively, it may also be the string ``'*'``, in which case
        all descending mapped classes will be added to the FROM clause.

    :param aliased: when True, the selectable will be wrapped in an
        alias, that is ``(SELECT * FROM <fromclauses>) AS anon_1``.
        This can be important when using the with_polymorphic()
        to create the target of a JOIN on a backend that does not
        support parenthesized joins, such as SQLite and older
        versions of MySQL.   However if the
        :paramref:`.with_polymorphic.selectable` parameter is in use
        with an existing :class:`.Alias` construct, then you should not
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        someoption(a1).someoption(a1.b) # -> fn(a1, a1) -> True

        wp = with_polymorphic(A, [A1, A2])
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    of the test program still cause the failure behavior to change.

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