john-bodley commented on a change in pull request #9082: [fix] Issue with 
previously defined SQL configuration
URL: 
https://github.com/apache/incubator-superset/pull/9082#discussion_r374466253
 
 

 ##########
 File path: superset/models/core.py
 ##########
 @@ -297,24 +297,26 @@ def get_sqla_engine(
         if nullpool:
             params["poolclass"] = NullPool
 
+        connect_args = params.get("connect_args", {})
+
         # If using Hive, this will set 
hive.server2.proxy.user=$effective_username
-        configuration: Dict[str, Any] = {}
+        configuration = connect_args.get("configuration", {})
         configuration.update(
             self.db_engine_spec.get_configuration_for_impersonation(
                 str(sqlalchemy_url), self.impersonate_user, effective_username
             )
         )
         if configuration:
-            d = params.get("connect_args", {})
-            d["configuration"] = configuration
-            params["connect_args"] = d
+            connect_args["configuration"] = configuration
 
 Review comment:
   I simply renamed `d` to the more descriptive `connect_args`. 

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