diff --git a/README.md b/README.md
index 9db866e..6ca45b1 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
+# Notice
+We strongly recommend using the [databend-driver](https://pypi.org/project/databend-driver) as it provides more comprehensive features.
+
+
 # databend-py
 
 Databend Cloud Python Driver with native http interface support
diff --git a/databend_py/client.py b/databend_py/client.py
index 081ab89..fad3744 100644
--- a/databend_py/client.py
+++ b/databend_py/client.py
@@ -77,8 +77,7 @@ def _iter_receive_result(self, query, query_id=None, with_column_types=False):
         )
         _, rows = result.get_result()
         for row in rows:
-            for r in row:
-                yield r
+            yield row
 
     def execute(
             self, query, params=None, with_column_types=False, query_id=None, settings=None
diff --git a/examples/iter_query.py b/examples/iter_query.py
index 851943a..c943a4f 100644
--- a/examples/iter_query.py
+++ b/examples/iter_query.py
@@ -3,7 +3,7 @@
 
 def iter_query():
     client = Client.from_url("http://root:root@localhost:8000")
-    result = client.execute_iter("select 1", with_column_types=False)
+    result = client.execute_iter("select 1, 2, 3 from numbers(3)", with_column_types=False)
     result_list = [i for i in result]
-    # result_list is [1]
+    # result_list is [(1, 2, 3), (1, 2, 3), (1, 2, 3)]
     print(result_list)
diff --git a/tests/test_client.py b/tests/test_client.py
index 42cf8c7..0b48ead 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -153,12 +153,11 @@ def test_batch_insert_with_dict_multi_fields(self):
 
     def test_iter_query(self):
         client = Client.from_url(self.databend_url)
-        result = client.execute_iter("select 1", with_column_types=False)
+        result = client.execute_iter("select 1, 2, 3 from numbers(3)", with_column_types=False)
         self.assertIsInstance(result, types.GeneratorType)
         result_list = [i for i in result]
         print(result_list)
-        self.assertEqual(result_list, [1])
-        self.assertEqual(list(result), [])
+        self.assertEqual(result_list, [(1, 2, 3), (1, 2, 3), (1, 2, 3)])
 
     def test_insert(self):
         client = Client.from_url(self.databend_url)