Fixed #25894 -- Fixed evaluation of zero-length slices of QuerySet.values().

django/db/models/sql/compiler.py

@@ -363,8 +363,6 @@ class SQLCompiler(object):
         If 'with_limits' is False, any limit/offset information is not included
         in the query.
         """
-        if with_limits and self.query.low_mark == self.query.high_mark:
-            return '', ()
         self.subquery = subquery
         refcounts_before = self.query.alias_refcount.copy()
         try:

docs/releases/1.9.1.txt

@@ -37,3 +37,6 @@ Bugfixes
 
 * Prevented ``QuerySet.delete()`` from crashing on MySQL when querying across
   relations (:ticket`25882`).
+
+* Fixed evaluation of zero-length slices of ``QuerySet.values()``
+  (:ticket:`25894`).

tests/queries/tests.py

@@ -2429,6 +2429,12 @@ class WeirdQuerysetSlicingTests(BaseQuerysetTest):
     def test_empty_sliced_subquery_exclude(self):
         self.assertEqual(Eaten.objects.exclude(food__in=Food.objects.all()[0:0]).count(), 1)
 
+    def test_zero_length_values_slicing(self):
+        n = 42
+        with self.assertNumQueries(0):
+            self.assertQuerysetEqual(Article.objects.values()[n:n], [])
+            self.assertQuerysetEqual(Article.objects.values_list()[n:n], [])
+
 
 class EscapingTests(TestCase):
     def test_ticket_7302(self):