| From: | Neil Conway <neilc(at)samurai(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl>, Josh Berkus <josh(at)agliodbs(dot)com>, Michael Fuhr <mike(at)fuhr(dot)org>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Functionscan estimates |
| Date: | 2005-04-10 05:25:25 |
| Message-ID: | 4258B8C5.7030305@samurai.com |
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| Lists: | pgsql-hackers pgsql-performance |
Tom Lane wrote:
> Not too many releases ago, there were several columns in pg_proc that
> were intended to support estimation of the runtime cost and number of
> result rows of set-returning functions. I believe in fact that these
> were the remains of Joe Hellerstein's thesis on expensive-function
> evaluation
FYI, Hellerstein's thesis on xfunc optimization is available here:
ftp://ftp.cs.wisc.edu/pub/tech-reports/reports/1996/tr1304.ps.Z
There's also a paper on this subject by Hellerstein that was published
in Transactions on Database Systems:
http://www.cs.berkeley.edu/~jmh/miscpapers/todsxfunc.pdf
I haven't had a chance to digest either one yet, but it might be worth a
look.
-Neil
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