Andres Freund <andres(at)anarazel(dot)de> writes:
> Done that way. It's a bit annoying, because we've to take care to
> initialize the "unused" part of the array with a valid signalling it's
> an unused mapping. Can't use 0 for that because fmgr_builtins[0] is a
> valid entry.
The prototype code I posted further upthread just used -1 as the "unused"
marker. There's no reason the array can't be int16 rather than uint16,
and "if (index < 0)" is probably a faster test anyway.
regards, tom lane