Simplify None handling in query_tags serialization

Signed-off-by: Sreekanth Vadigi <sreekanth.vadigi@databricks.com>

Author: sreekanth-db

src/databricks/sql/backend/sea/models/requests.py

@@ -62,11 +62,10 @@ def to_dict(self) -> Dict[str, Any]:
             ]
 
         # SEA API expects query_tags as an array of {key, value} objects.
-        # None values are represented by omitting the "value" field.
+        # None/empty values are left to the server to handle as key-only tags.
         if self.query_tags:
             result["query_tags"] = [
-                {"key": k, "value": v} if v is not None else {"key": k}
-                for k, v in self.query_tags.items()
+                {"key": k, "value": v} for k, v in self.query_tags.items()
             ]
 
         return result

tests/unit/test_sea_backend.py

@@ -473,7 +473,7 @@ def test_execute_command_query_tags_none_value(
         _, kwargs = mock_http_client._make_request.call_args
         assert kwargs["data"]["query_tags"] == [
             {"key": "env", "value": "prod"},
-            {"key": "team"},
+            {"key": "team", "value": None},
         ]
 
     def test_execute_command_no_query_tags_omitted(