From c53af5661313079d022553b6c775e6c4f8d34927 Mon Sep 17 00:00:00 2001
From: Florian Apolloner <florian@apolloner.eu>
Date: Sun, 21 Oct 2018 20:42:34 +0200
Subject: [PATCH] Fixed #29847 -- Ensured proper ordering in queries.
Even though good databases tend to keep the result sorted by the/one
window expression and the planners are smart enough to not resort if not
required, it is not valid to rely on this.
MariaDB specifically did return whatever order it wanted, which is
completely okay. Now we sort towards the expected data for all databases.
---
tests/expressions_window/tests.py | 18 ++++--------------
1 file changed, 4 insertions(+), 14 deletions(-)
diff --git a/tests/expressions_window/tests.py b/tests/expressions_window/tests.py
index 182f7d594b..ba757dfb94 100644
--- a/tests/expressions_window/tests.py
+++ b/tests/expressions_window/tests.py
@@ -16,13 +16,6 @@ from django.test import SimpleTestCase, TestCase, skipUnlessDBFeature
from .models import Employee
-def fix_ordering_for_mariadb(qs, ordering):
- if connection.vendor == 'mysql' and connection.mysql_is_mariadb:
- # MariaDB requires repeating the ordering when using window functions
- qs = qs.order_by(*ordering)
- return qs
-
-
@skipUnlessDBFeature('supports_over_clause')
class WindowFunctionTests(TestCase):
@classmethod
@@ -193,8 +186,7 @@ class WindowFunctionTests(TestCase):
expression=Lag(expression='salary', offset=1),
partition_by=F('department'),
order_by=[F('salary').asc(), F('name').asc()],
- )).order_by('department')
- qs = fix_ordering_for_mariadb(qs, ('department', F('salary').asc(), F('name').asc()))
+ )).order_by('department', F('salary').asc(), F('name').asc())
self.assertQuerysetEqual(qs, [
('Williams', 37000, 'Accounting', None),
('Jenson', 45000, 'Accounting', 37000),
@@ -257,8 +249,8 @@ class WindowFunctionTests(TestCase):
expression=Lead(expression='salary'),
order_by=[F('hire_date').asc(), F('name').desc()],
partition_by='department',
- )).values_list('name', 'salary', 'department', 'hire_date', 'lead')
- qs = fix_ordering_for_mariadb(qs, ('department', F('hire_date').asc(), F('name').desc()))
+ )).values_list('name', 'salary', 'department', 'hire_date', 'lead') \
+ .order_by('department', F('hire_date').asc(), F('name').desc())
self.assertNotIn('GROUP BY', str(qs.query))
self.assertSequenceEqual(qs, [
('Jones', 45000, 'Accounting', datetime.date(2005, 11, 1), 45000),
@@ -381,9 +373,7 @@ class WindowFunctionTests(TestCase):
expression=Lead(expression='salary'),
order_by=[F('hire_date').asc(), F('name').desc()],
partition_by='department',
- )).order_by('department')
- ('department', F('hire_date').asc(), F('name').desc())
- qs = fix_ordering_for_mariadb(qs, ('department', F('hire_date').asc(), F('name').desc()))
+ )).order_by('department', F('hire_date').asc(), F('name').desc())
self.assertQuerysetEqual(qs, [
('Jones', 45000, 'Accounting', datetime.date(2005, 11, 1), 45000),
('Jenson', 45000, 'Accounting', datetime.date(2008, 4, 1), 37000),