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�fd�|D���g�������tj|��|��S)a0Create 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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a)Generate "identity key" tuples, as are used as keys in the
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    * ``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:`_orm.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:`_engine.ResultProxy`
       (must be given as a keyword arg)
      :param identity_token: optional identity token

        .. versionadded:: 1.2 added identity_token

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

    The ORM equivalent of a :func:`~sqlalchemy.sql.expression.alias`
    construct, this object mimics the mapped class using a
    ``__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:`_orm.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:`_orm.Mapper`, aliased selectable, and other information
    using :func:`_sa.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`


    NFr+c���t|��}|�|j�||���}t|||||r|n|j|�|n|j||	||
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�'�'�'�'�'r2r�c���eZdZdZd�Zed���ZdZ	ed���Zed���Z	d�Z
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�Zd�Zd�ZdS)r�a�Provide an inspection interface for an
    :class:`.AliasedClass` object.

    The :class:`.AliasedInsp` object is returned
    given an :class:`.AliasedClass` using the
    :func:`_sa.inspect` function::

        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:`_orm.Mapper` mapping the underlying class.
    * ``selectable`` - the :class:`_expression.Alias`
      construct which ultimately
      represents an aliased :class:`_schema.Table` or
      :class:`_expression.Select`
      construct.
    * ``name`` - the name of the alias.  Also is used as the attribute
      name when returned in a result tuple from :class:`_query.Query`.
    * ``with_polymorphic_mappers`` - collection of :class:`_orm.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`

    c�b�tj|��|_||_|x|_x|_|_||_||_tj|p|��|_	||_
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    See :meth:`_query.Query.join` for information on modern usage
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    of the test program still cause the failure behavior to change.

    By calling ``randomize_unitofwork()`` when a script first runs, the
    ordering of a key series of sets within the unit of work implementation
    are randomized, so that the script can be minimized down to the
    fundamental mapping and operation that's failing, while still reproducing
    the issue on at least some runs.

    This utility is also available when running the test suite via the
    ``--reversetop`` flag.

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