erratic-pattern commented on code in PR #5433:
URL: https://github.com/apache/arrow-rs/pull/5433#discussion_r1511417517


##########
arrow-flight/examples/flight_sql_server.rs:
##########
@@ -617,7 +618,7 @@ impl FlightSqlService for FlightSqlServiceImpl {
         &self,
         _query: CommandPreparedStatementQuery,
         _request: Request<PeekableFlightDataStream>,
-    ) -> Result<Response<<Self as FlightService>::DoPutStream>, Status> {
+    ) -> Result<Option<DoPutPreparedStatementResult>, Status> {

Review Comment:
   But yes to answer your question, the result is potentially missing due to 
legacy behavior and the types here indicate that directly. This is because the 
inner handle was originally specified to be *mandatory* if the result is 
provided. I've updated the protobuf in the spec PR (apache/arrow#40243) to make 
the handle field itself `optional`.
   
   So with that protobuf change, what we could do is make the inner handle 
field an `Option` and use a `Default` implementation on 
`DoPutPreparedStatementResult` to handle the case where it's missing,



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