Robert Haas <robertmhaas@gmail.com> writes:
> Heh. I was actually asking an even stupider question, which is why do
> we need to keep all of them in ANY centrally known data structure?
> What operation do we perform that requires us to find all of the
> exstant TTS?
ExecDropTupleTable is used to release slot-related buffer pins and
tupdesc refcounts at conclusion of a query. I suppose we could require
the individual plan node End routines to do it instead. Not sure if
that's an improvement.
regards, tom lane