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The buildfarm thinks this leads to memory stomps, though annoyingly I can't duplicate that here. The existing code in strings.pgc is doing something that doesn't seem to be sanctioned at all really by the documentation, but I'm disinclined to try to make that nicer right now. Let's just declare some more output variables in hopes of working around it.
src/interfaces/ecpg/README.dynSQL
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.