Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com> writes:
> I'd thought that I'd previously sent a message containing a set of
> definitions for the reverse opclasses (not meant for inclusion to the
> system because I was making SQL functions that basically did -<normal
> comparison function> to use as the function of the operator class, but
> possibly worth playing with) but now that I actually search again, I don't
> see it.
I don't recall having seen such a thing go by...
I fear that using SQL functions as comparators would only be useful for
proof-of-concept, not as an industrial-strength implementation. The
index code needs comparator functions not to leak memory, and I doubt
that that could be guaranteed with a SQL function. You'd probably have
speed issues too.
regards, tom lane
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