lidavidm commented on code in PR #34817:
URL: https://github.com/apache/arrow/pull/34817#discussion_r1166417678


##########
format/FlightSql.proto:
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@@ -1842,6 +1842,94 @@ message ActionCancelQueryResult {
   CancelResult result = 1;
 }
 
+/*
+ * Request message for the "Close Session" action.
+ */
+message ActionCloseSessionRequest {

Review Comment:
   Ok, thanks - that's what I was trying to get at.
   
   Without the middleware, how do you expect servers to do all this? 
   
   What is the concern about having middleware? Is it possible to build a set 
of low-level helpers (presumably, what a server would need to do if it didn't 
have middleware) as well as a higher-level middleware using those helpers?
    
   Also, I am not sure the headers are only a legacy path. Not all clients are 
willing or able to maintain persistent state (and/or persistent state may be 
unreliable). So we should consider the headers as a first-class path as well.



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