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Re: BUG #5705: btree_gist: Index on inet changes query result

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Andreas Karlsson <andreas(at)proxel(dot)se>, pgsql-bugs(at)postgresql(dot)org
Subject: Re: BUG #5705: btree_gist: Index on inet changes query result
Date: 2010-10-19 20:57:05
Message-ID: AANLkTin4Qt4XVF8s1UxHP36guTDHdSUPmCFukF0Oimw4@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-bugs
On Mon, Oct 11, 2010 at 7:50 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> "Andreas Karlsson" <andreas(at)proxel(dot)se> writes:
>> I was looking at the code to see how one would improve indexing of the inet
>> types and saw an inconsistency between the compressed format
>> (gbt_inet_compress) and how network_cmp_internal works. The btree_gist
>> module ignores the netmask.
>
> Well, actually the btree_gist implementation for inet is a completely
> broken piece of junk: it thinks that convert_network_to_scalar is 100%
> trustworthy and can be used as a substitute for the real comparison
> functions, which isn't even approximately true.  I'm not sure why
> Teodor implemented it like that instead of using the type's real
> comparison functions, but it's pretty much useless if you want the
> same sort order that the type itself defines.

Are you planning to fix this?

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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Subject: Re: BUG #5705: btree_gist: Index on inet changes query result
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