Fixed #24148 -- Documented a bug with case expressions in SQLite < 3.7.0

.. _documented at sqlite.org: http://www.sqlite.org/faq.html#q18

Old SQLite and ``CASE`` expressions

-----------------------------------

SQLite 3.6.23.1 and older contains a bug when `handling query parameters`_ in

a ``CASE`` expression that contains an ``ELSE`` and arithmetic.

SQLite 3.6.23.1 was released in March 2010, and most current binary

distributions for different platforms include a newer version of SQLite, with

the notable exception of the Python 2.7 installers for Windows.

As of this writing, the latest release for Windows - Python 2.7.9 - includes

SQLite 3.6.21. You can install ``pysqlite2`` or replace ``sqlite3.dll`` (by

default installed in ``C:\Python27\DLLs``) with a newer version from

http://www.sqlite.org/ to remedy this issue.

.. _handling query parameters: https://code.djangoproject.com/ticket/24148

.. _using-newer-versions-of-pysqlite:

Using newer versions of the SQLite DB-API 2.0 driver

from uuid import UUID

from django.core.exceptions import FieldError

from django.db import models

from django.db import connection, models

from django.db.models import F, Q, Value, Min, Max

from django.db.models.expressions import Case, When

from django.test import TestCase

            transform=attrgetter('integer', 'test')

        )

    if connection.vendor == 'sqlite' and connection.Database.sqlite_version_info < (3, 7, 0):

        # There is a bug in sqlite < 3.7.0, where placeholder order is lost.

        # Thus, the above query returns  <condition_value> + <result_value>

        # for each matching case instead of <result_value> + 1 (#24148).

        test_combined_expression = unittest.expectedFailure(test_combined_expression)

    def test_in_subquery(self):

        self.assertQuerysetEqual(

            CaseTestModel.objects.filter(