| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Hannu Krosing <hannu(at)tm(dot)ee> |
| Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: pg_index.indislossy |
| Date: | 2001-05-14 21:49:22 |
| Message-ID: | 200105142149.f4ELnMV08293@candle.pha.pa.us |
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| Lists: | pgsql-hackers |
> Bruce Momjian wrote:
> >
> > Can someone tell me what we use indislossy for?
>
> IIRC it means that if you get something by this index you must check
> again in the actual data
>
> I think that at least the GIST intarray (actually intset) methods use
> it.
>
> So you probably should _not_ remove it ;)
I did a search and found it used only a few places. I do not see it
used as part of GIST. My rememberance is that it is involved in partial
indexes, where you index only certain values in a column. It was an old
idea that was never working in PostgreSQL.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
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