Re: Remove lossy-operator RECHECK flag?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Teodor Sigaev <teodor(at)sigaev(dot)ru>
Cc: Pgsql Hackers <pgsql-hackers(at)postgresql(dot)org>, Heikki Linnakangas <heikki(at)enterprisedb(dot)com>
Subject: Re: Remove lossy-operator RECHECK flag?
Date: 2008-04-14 18:28:51
Message-ID: 19670.1208197731@sss.pgh.pa.us
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Teodor Sigaev <teodor(at)sigaev(dot)ru> writes:
>> By the argument that it's better to break things obviously than to
>> break them subtly, risking case 4 seems more attractive than risking
>> case 2.

> The single thought is: usually, it's very hard to see that query returns more
> results that it should be. It doesn't matter for fulltext search (and it has
> very good chance to stay unnoticed forever because wrong rows will be sorted
> down by ranking function, although performance will decrease.

Hmm ... that's a good point. And the performance loss that I'm
complaining about is probably not large, unless you've got a *really*
expensive operator. Maybe we should leave it as-is.

Anybody else have an opinion?

regards, tom lane

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