Re: [HACKERS] Binary search in fmgr_isbuiltin() is a bottleneck.

Andres Freund <andres@anarazel.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


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