fix(flightsql): remove Any encoding of DoPutPreparedStatementUpdateResult (#5817)

Author: erratic-pattern

arrow-flight/src/sql/client.rs

@@ -552,10 +552,9 @@ impl PreparedStatement<Channel> {
         &self,
         put_result: &PutResult,
     ) -> Result<Option<Bytes>, ArrowError> {
-        let any = Any::decode(&*put_result.app_metadata).map_err(decode_error_to_arrow_error)?;
-        Ok(any
-            .unpack::<DoPutPreparedStatementResult>()?
-            .and_then(|result| result.prepared_statement_handle))
+        let result: DoPutPreparedStatementResult =
+            Message::decode(&*put_result.app_metadata).map_err(decode_error_to_arrow_error)?;
+        Ok(result.prepared_statement_handle)
     }
 
     /// Close the prepared statement, so that this PreparedStatement can not used

arrow-flight/src/sql/server.rs

@@ -718,7 +718,7 @@ where
                     .do_put_prepared_statement_query(command, request)
                     .await?;
                 let output = futures::stream::iter(vec![Ok(PutResult {
-                    app_metadata: result.as_any().encode_to_vec().into(),
+                    app_metadata: result.encode_to_vec().into(),
                 })]);
                 Ok(Response::new(Box::pin(output)))
             }