Andres Freund <> 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

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