I don't have the original thread in my inbox anymore, so for reference:
Tom Lane last said:
> I have committed a patch into CVS HEAD --- give it a try.
It took me awhile, but I finally got around to trying this (by plopping
it into my 7.4 sources), and yes, the hashlookup does significantly
improve the performance of calling "C" functions. I agree with your
commit message that they're now roughly on par with built-in functions.
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