| From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | vadim(at)krs(dot)ru (Vadim Mikheev) |
| Cc: | bamby(at)marka(dot)net(dot)ua, hackers(at)postgreSQL(dot)org |
| Subject: | Re: [HACKERS] Re: [BUGS] General Bug Report: Bug in optimizer |
| Date: | 1999-03-18 19:00:20 |
| Message-ID: | 199903181900.OAA05914@candle.pha.pa.us |
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| Lists: | pgsql-bugs pgsql-hackers |
> Bruce Momjian wrote:
> >
> > My guess is that the creation of the index updates the table size
> > statistics.
>
> Yes.
>
> > However, when I see zero size, I don't know if it is accurate, or if
> > someone has added rows since the last vacuum/index creation, so I think
> > it is correct to use an index on a zero-length table if it is
> > appropriate. If the size is 1, I will assume that number is accurate,
> > and do a sequential scan.
> >
> > Does that make sense?
>
> Yes. But we have to fix SeqScan for field1 = -1...
Woh, I just tried it myself, and was able to reproduce it. I will check
into it now. Gee, that is very strange.
--
Bruce Momjian | http://www.op.net/~candle
maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026
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