Fix GROUP BY alias in subquery generation

Author: prabhbir

tests/test_group_by.py

@@ -1,7 +1,7 @@
 from tests.testmodels import Author, Book, Event, Team, Tournament
 from tortoise.contrib import test
 from tortoise.functions import Avg, Count, Sum, Upper
-
+from tortoise.expressions import Subquery
 
 class TestGroupBy(test.TestCase):
     async def asyncSetUp(self) -> None:
@@ -317,3 +317,19 @@ async def test_group_by_nested_column(self):
     async def test_group_by_id_with_nested_filter(self):
         ret = await Book.filter(author__name="author1").group_by("id").values_list("id")
         self.assertEqual(set(ret), {(book.id,) for book in self.books1})
+    
+    async def test_subquery_group_by_no_alias(self):
+        
+        query = Author.annotate(
+            book_name=Subquery(
+                Book.all().group_by("name").order_by("name").limit(1).values("name")
+            )
+        )
+        
+        sql = query.sql()
+        
+        self.assertIn('GROUP BY "name"', sql)
+        self.assertNotIn('GROUP BY "name" "', sql)
+        
+        result = await query.values("name", "book_name")
+        self.assertIsInstance(result, list)

tortoise/queryset.py

@@ -1598,9 +1598,7 @@ def _resolve_group_bys(self, *field_names: str) -> list:
                 field=field,
                 forwarded_fields=forwarded_fields,
             )
-            field = related_table[related_db_field].as_(
-                f"{related_table.get_table_name()}__{field_name}"
-            )
+            field = related_table[related_db_field]
             group_bys.append(field)
         return group_bys