Refs #24385 -- Added tests for distinct sum issue fixed in c7fd9b24

        vals = Book.objects.annotate(num_authors=Count("authors__id")).aggregate(Avg("num_authors"))

        self.assertEqual(vals, {"num_authors__avg": Approximate(1.66, places=1)})

    def test_sum_distinct_aggregate(self):

        """

        Sum on a distict() QuerySet should aggregate only the distinct items.

        """

        authors = Author.objects.filter(book__in=[5, 6])

        self.assertEqual(authors.count(), 3)

        distinct_authors = authors.distinct()

        self.assertEqual(distinct_authors.count(), 2)

        # Selected author ages are 57 and 46

        age_sum = distinct_authors.aggregate(Sum('age'))

        self.assertEqual(age_sum['age__sum'], 103)

    def test_filtering(self):

        p = Publisher.objects.create(name='Expensive Publisher', num_awards=0)

        Book.objects.create(