Andres Freund <andres(at)anarazel(dot)de> writes:
> Honestly before going there I'd rather just have
> an oid indexed array, computed at compile time.
Yeah, I'd been kind of wondering about that approach too. We could have,
say, a table of int16s indexed by OIDs from 0 to 9999, containing zero or
an index into the table of FmgrBuiltin structs. So 20000 bytes of
constant data, and O(negligible) lookup time other than possible cache
misses on this table. But a dynahash-ish hash table built for 2800+
entries would probably be about that size ...
regards, tom lane