On Fri, 2011-10-07 at 12:54 +0400, Alexander Korotkov wrote: > The first thing caught my eye in existing GiST code is idea of > subtype_float. float8 has limited precision and can't respresent, for > example, varlena values good enough. Even if we have large int8 value > we can loose lower bits, but data distribution can be so that these > bits are valuable. Wouldn't it better to have function like > subtype_diff_float which returns difference between two values of > subtype as an float? Using of such function could make penalty more > sensible to even small difference between values, and accordingly more > relevant. > I started implementing subtype_diff, and I noticed that it requires defining an extra function for each range type. Previously, the numeric types could just use a cast, which was convenient for user-defined range types.
If you have any other ideas to make that cleaner, please let me know. Otherwise I'll just finish implementing subtype_diff. Regards, Jeff Davis -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers