* Jeff Davis: > On Tue, 2011-01-04 at 14:18 +0000, Florian Weimer wrote: >> * Jeff Davis: >> >> > 4. For the GiST penalty function, and perhaps some picksplit algorithms, >> > it might be nice to know the length of a range, or do some other kinds >> > of math. It introduces a lot of complexity to try to define math >> > functions for each subtype, and try to make sure they behave sanely. So >> > I was thinking that the user might need to specify a function that >> > converts the subtype into a float that approximates a value's position >> > in the total order. >> >> Doesn't the eqsel hint already provide this information?
> Can you clarify what you mean? I don't know what the "eqsel hint" is. Uhm, it's not not eqsel, but the RESTRICT clause on operators: <http://www.postgresql.org/docs/8.4/static/xoper-optimization.html> I'm wondering if one of these hint functions can be reused to compute range lengths. -- Florian Weimer <fwei...@bfk.de> BFK edv-consulting GmbH http://www.bfk.de/ Kriegsstraße 100 tel: +49-721-96201-1 D-76133 Karlsruhe fax: +49-721-96201-99 -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
