another attempt at this

dbt/adapters/databricks/connections.py

@@ -889,6 +889,18 @@ def release(self) -> None:
 
         conn._release()
 
+    # override
+    @classmethod
+    def close(cls, connection: Connection) -> Connection:
+        if not USE_LONG_SESSIONS:
+            return super().close(connection)
+
+        try:
+            return super().close(connection)
+        except Exception as e:
+            logger.warning(f"ignoring error when closing connection: {e}")
+            return connection
+
     # override
     def cleanup_all(self) -> None:
         if not USE_LONG_SESSIONS:
@@ -1067,10 +1079,7 @@ def _cleanup_idle_connections(self) -> None:
                 for conn in thread_conns.values():
                     if conn.acquire_release_count == 0 and conn._idle_too_long():
                         logger.debug(f"closing idle connection: {conn._get_conn_info_str()}")
-                        try:
-                            self.close(conn)
-                        except Exception as e:
-                            logger.warning(f"ignoring error when closing connection: {e}")
+                        self.close(conn)
 
                         conn.handle = LazyHandle(self._open2)