indigophox commented on code in PR #34817:
URL: https://github.com/apache/arrow/pull/34817#discussion_r1240464433


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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:
   > I'm referring to the options themselves; I thought the original proposal 
was that servers should also support sending options as arbitrary headers, 
since the existing JDBC driver does that.
   
   At least internally we're looking at moving a bunch of things off of being 
sent as headers and over to session options.  For backwards compatibility 
internally as well as in the wild I'm inclined to pursue making the JDBC and 
ODBC drivers detect the Session Option doAction verbs and use them if present 
and only fall back to headers if the verbs are absent.  (Relatedly, it might be 
useful to have the doAction listing populated dynamically or overridden by the 
app's client subclass as the discrepancy between the listing and what Actions 
do and do not return a not implemented status message is a bit confusing for 
this and other purposes...)



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