Make aggregates fully support column aliases

tests/__init__.py

@@ -17,6 +17,10 @@ def count_sql_calls(conn, cursor, statement, parameters, context, executemany):
         conn.query_count += 1
     except AttributeError:
         conn.query_count = 0
+    try:
+        conn.queries.append(statement)
+    except AttributeError:
+        conn.queries = [statement]
 
 
 warnings.simplefilter('error', sa.exc.SAWarning)
@@ -55,6 +59,7 @@ class TestCase(object):
     def teardown_method(self, method):
         aggregates.manager.reset()
         self.session.close_all()
+        self.connection.queries = []
         if self.create_tables:
             self.Base.metadata.drop_all(self.connection)
         self.connection.close()

tests/aggregate/test_m2m_m2m.py

@@ -76,5 +76,6 @@ class TestAggregateManyToManyAndManyToMany(TestCase):
         catalog2 = self.Catalog(products=products)
         self.session.add(catalog)
         self.session.commit()
+        print self.connection.queries[-1]
         assert catalog.category_count == 1
         assert catalog2.category_count == 1