Re: pg_index.indislossy

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От Bruce Momjian
Тема Re: pg_index.indislossy
Дата
Msg-id 200105142149.f4ELnMV08293@candle.pha.pa.us
обсуждение исходный текст
Ответ на Re: pg_index.indislossy  (Hannu Krosing <hannu@tm.ee>)
Ответы Re: pg_index.indislossy  (The Hermit Hacker <scrappy@hub.org>)
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> 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@candle.pha.pa.us               |  (610)
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