fixes

Author: rustyconover

src/query_farm_server_base/server.py

@@ -650,7 +650,7 @@ def exchange_scalar_function(
         descriptor: flight.FlightDescriptor,
         reader: flight.MetadataRecordBatchReader,
         writer: flight.MetadataRecordBatchWriter,
-    ) -> int:
+    ) -> None:
         self._unimplemented_exchange_operation(ExchangeOperation.SCALAR_FUNCTION)
 
     def exchange_update(