Fixed #21603 -- Fixed complex RawQuerySets queries on some versions of SQLite.

django/db/backends/__init__.py

@@ -1267,6 +1267,14 @@ class BaseDatabaseIntrospection(object):
         """
         return name
 
+    def column_name_converter(self, name):
+        """
+        Apply a conversion to the column name for the purposes of comparison.
+
+        Uses table_name_converter() by default.
+        """
+        return self.table_name_converter(name)
+
     def table_names(self, cursor=None):
         """
         Returns a list of names of all tables that exist in the database.

django/db/backends/sqlite3/introspection.py

@@ -68,6 +68,21 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
         return [FieldInfo(info['name'], info['type'], None, info['size'], None, None,
                  info['null_ok']) for info in self._table_info(cursor, table_name)]
 
+    def column_name_converter(self, name):
+        """
+        SQLite will in some cases, e.g. when returning columns from views and
+        subselects, return column names in 'alias."column"' format instead of
+        simply 'column'.
+
+        Affects SQLite < 3.7.15, fixed by http://www.sqlite.org/src/info/5526e0aa3c
+        """
+        # TODO: remove when SQLite < 3.7.15 is sufficiently old.
+        # 3.7.13 ships in Debian stable as of 2014-03-21.
+        if self.connection.Database.sqlite_version_info < (3, 7, 15):
+            return name.split('.')[-1].strip('"')
+        else:
+            return name
+
     def get_relations(self, cursor, table_name):
         """
         Returns a dictionary of {field_index: (field_index_other_table, other_table)}

django/db/models/sql/query.py

@@ -66,7 +66,7 @@ class RawQuery(object):
     def get_columns(self):
         if self.cursor is None:
             self._execute_query()
-        converter = connections[self.using].introspection.table_name_converter
+        converter = connections[self.using].introspection.column_name_converter
         return [converter(column_meta[0])
                 for column_meta in self.cursor.description]
 

tests/raw_query/tests.py

@@ -239,3 +239,9 @@ class RawQueryTests(TestCase):
 
     def test_query_count(self):
         self.assertNumQueries(1, list, Author.objects.raw("SELECT * FROM raw_query_author"))
+
+    def test_subquery_in_raw_sql(self):
+        try:
+            list(Book.objects.raw('SELECT "id" FROM (SELECT * FROM raw_query_book WHERE paperback) sq'))
+        except InvalidQuery:
+            self.fail("Using a subquery in a RawQuerySet raised InvalidQuery")