diff --git a/django/db/models/sql/query.py b/django/db/models/sql/query.py index 344b2986880..7ba94f205b0 100644 --- a/django/db/models/sql/query.py +++ b/django/db/models/sql/query.py @@ -351,7 +351,7 @@ class Query(object): # is selected. col_cnt += 1 col_alias = '__col%d' % col_cnt - self.annotation_select[col_alias] = expr + self.annotations[col_alias] = expr self.append_annotation_mask([col_alias]) new_exprs.append(Ref(col_alias, expr)) else: @@ -390,10 +390,22 @@ class Query(object): from django.db.models.sql.subqueries import AggregateQuery outer_query = AggregateQuery(self.model) inner_query = self.clone() - if not has_limit and not self.distinct_fields: - inner_query.clear_ordering(True) inner_query.select_for_update = False inner_query.select_related = False + if not has_limit and not self.distinct_fields: + # Queries with distinct_fields need ordering and when a limit + # is applied we must take the slice from the ordered query. + # Otherwise no need for ordering. + inner_query.clear_ordering(True) + if not inner_query.distinct: + # If the inner query uses default select and it has some + # aggregate annotations, then we must make sure the inner + # query is grouped by the main model's primary key. However, + # clearing the select clause can alter results if distinct is + # used. + if inner_query.default_cols and has_existing_annotations: + inner_query.group_by = [self.model._meta.pk.get_col(inner_query.get_initial_alias())] + inner_query.default_cols = False relabels = {t: 'subquery' for t in inner_query.tables} relabels[None] = 'subquery' @@ -404,7 +416,14 @@ class Query(object): if expression.is_summary: expression, col_cnt = inner_query.rewrite_cols(expression, col_cnt) outer_query.annotations[alias] = expression.relabeled_clone(relabels) - del inner_query.annotation_select[alias] + del inner_query.annotations[alias] + # Make sure the annotation_select wont use cached results. + inner_query.set_annotation_mask(inner_query.annotation_select_mask) + if inner_query.select == [] and not inner_query.default_cols and not inner_query.annotation_select_mask: + # In case of Model.objects[0:3].count(), there would be no + # field selected in the inner query, yet we must use a subquery. + # So, make sure at least one field is selected. + inner_query.select = [self.model._meta.pk.get_col(inner_query.get_initial_alias())] try: outer_query.add_subquery(inner_query, using) except EmptyResultSet: diff --git a/tests/aggregation_regress/tests.py b/tests/aggregation_regress/tests.py index 58a226c95cd..bc6a55875d9 100644 --- a/tests/aggregation_regress/tests.py +++ b/tests/aggregation_regress/tests.py @@ -7,7 +7,9 @@ from operator import attrgetter from django.contrib.contenttypes.models import ContentType from django.core.exceptions import FieldError -from django.db.models import F, Q, Avg, Count, Max, StdDev, Sum, Variance +from django.db.models import ( + F, Q, Avg, Count, Max, StdDev, Sum, Value, Variance, +) from django.test import TestCase, skipUnlessDBFeature from django.test.utils import Approximate from django.utils import six @@ -1129,6 +1131,14 @@ class AggregationTests(TestCase): 'select__avg': Approximate(1.666, places=2), }) + def test_annotate_distinct_aggregate(self): + # There are three books with rating of 4.0 and two of the books have + # the same price. Hence, the distinct removes one rating of 4.0 + # from the results. + vals1 = Book.objects.values('rating', 'price').distinct().aggregate(result=Sum('rating')) + vals2 = Book.objects.aggregate(result=Sum('rating') - Value(4.0)) + self.assertEqual(vals1, vals2) + class JoinPromotionTests(TestCase): def test_ticket_21150(self): diff --git a/tests/expressions/models.py b/tests/expressions/models.py index 69de52c308e..1c1e9240792 100644 --- a/tests/expressions/models.py +++ b/tests/expressions/models.py @@ -12,6 +12,7 @@ from django.utils.encoding import python_2_unicode_compatible class Employee(models.Model): firstname = models.CharField(max_length=50) lastname = models.CharField(max_length=50) + salary = models.IntegerField(blank=True, null=True) def __str__(self): return '%s %s' % (self.firstname, self.lastname) diff --git a/tests/expressions/tests.py b/tests/expressions/tests.py index 7233fa0d080..59fd0631034 100644 --- a/tests/expressions/tests.py +++ b/tests/expressions/tests.py @@ -5,7 +5,7 @@ import uuid from copy import deepcopy from django.core.exceptions import FieldError -from django.db import DatabaseError, connection, transaction +from django.db import DatabaseError, connection, models, transaction from django.db.models import TimeField, UUIDField from django.db.models.aggregates import ( Avg, Count, Max, Min, StdDev, Sum, Variance, @@ -30,15 +30,15 @@ class BasicExpressionsTests(TestCase): def setUpTestData(cls): Company.objects.create( name="Example Inc.", num_employees=2300, num_chairs=5, - ceo=Employee.objects.create(firstname="Joe", lastname="Smith") + ceo=Employee.objects.create(firstname="Joe", lastname="Smith", salary=10) ) Company.objects.create( name="Foobar Ltd.", num_employees=3, num_chairs=4, - ceo=Employee.objects.create(firstname="Frank", lastname="Meyer") + ceo=Employee.objects.create(firstname="Frank", lastname="Meyer", salary=20) ) Company.objects.create( name="Test GmbH", num_employees=32, num_chairs=1, - ceo=Employee.objects.create(firstname="Max", lastname="Mustermann") + ceo=Employee.objects.create(firstname="Max", lastname="Mustermann", salary=30) ) def setUp(self): @@ -48,6 +48,15 @@ class BasicExpressionsTests(TestCase): "name", "num_employees", "num_chairs" ) + def test_annotate_values_aggregate(self): + companies = Company.objects.annotate( + salaries=F('ceo__salary'), + ).values('num_employees', 'salaries').aggregate( + result=Sum(F('salaries') + F('num_employees'), + output_field=models.IntegerField()), + ) + self.assertEqual(companies['result'], 2395) + def test_filter_inter_attribute(self): # We can filter on attribute relationships on same model obj, e.g. # find companies where the number of employees is greater