But with all due respect to Joe, I think the reason that stuff got
trimmed is that it didn't work very well.  In most cases it's
*hard* to write an estimator for a SRF.  Let's see you produce
one for dblink() for instance ...

Good one...
Well in some cases it'll be impossible, but suppose I have a function get_id_for_something() which just grabs an ID using dblink, then I know it returns one row, and pg would be interested in that information too !

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