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+descriptor statements have the following shortcomings
+
+- input descriptors (USING DESCRIPTOR <name>) are not supported
+
+ Reason: to fully support dynamic SQL the frontend/backend communication
+ should change to recognize input parameters.
+ Since this is not likely to happen in the near future and you
+ can cover the same functionality with the existing infrastructure
+ (using s[n]printf), I'll leave the work to someone else.