| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Matteo Beccati <php(at)beccati(dot)com> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Enhanced containment selectivity function |
| Date: | 2005-08-04 15:12:58 |
| Message-ID: | 15936.1123168378@sss.pgh.pa.us |
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Matteo Beccati <php(at)beccati(dot)com> writes:
> This also made me think: is there a reason why geometric selectivity
> functions return constant values rather than checking statistics for a
> better result?
Because no one's ever bothered to work on them. You should talk to
the PostGIS guys, however, because they *have* been working on real
statistics and real estimation functions for geometric types. It'd
be nice to get some of that work back-ported into the core database.
regards, tom lane
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