Re: Creating an index-type for LIKE '%value%'

From: "Larry Rosenman" <ler(at)lerctr(dot)org>
To: "'Oleg Bartunov'" <oleg(at)sai(dot)msu(dot)su>
Cc: <pgsql-general(at)postgresql(dot)org>
Subject: Re: Creating an index-type for LIKE '%value%'
Date: 2005-02-08 17:08:44
Message-ID: E1CyYrY-0004BJ-AQ@lerami.lerctr.org
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-general

Oleg Bartunov wrote:
> On Tue, 8 Feb 2005, Larry Rosenman wrote:
>
>> Oleg Bartunov wrote:
>>> On Tue, 8 Feb 2005, Larry Rosenman wrote:
>>>
>>>>
>>>> It doesn't seem to like pieces with hyphens ('-') in the name, when
>>>> I try To update blacklist set new_domain_lt=text2ltree(domain) I
>>>> get a Syntax error (apparently for the hyphens).
>>>>
>>>
>>> Try change definition of ISALNUM on ltree.h
>>>
>>> #define ISALNUM(x) ( isalnum((unsigned char)(x)) || (x) == '_'
>>> )
>>>
>>> this was already discussed
>>> http://www.pgsql.ru/db/mw/msg.html?mid=2034299
>>>
>> Thanks!
>>
>> Now, how can I make it always case-insensitive?
>>
>
> from http://www.sai.msu.su/~megera/postgres/gist/ltree/
>
> It is possible to use several modifiers at the end of a label:
>
>
> @ Do case-insensitive label matching
> * Do prefix matching for a label
> % Don't account word separator '_' in label matching,
> that is 'Russian%' would match 'Russian_nations',
> but not 'Russian'
>
>
>
>>
>>
>>
>
> Regards,
> Oleg
> _____________________________________________________________
> Oleg Bartunov, sci.researcher, hostmaster of AstroNet, Sternberg
> Astronomical Institute, Moscow University (Russia) Internet:
> oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
> phone: +007(095)939-16-83, +007(095)939-23-83

Does that apply to each node, or the entire string?

I'd like to not have to parse the lquery string and make each node following
it with an @.

LER

--
Larry Rosenman http://www.lerctr.org/~ler
Phone: +1 972-414-9812 E-Mail: ler(at)lerctr(dot)org
US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749

In response to

Responses

Browse pgsql-general by date

  From Date Subject
Next Message Oleg Bartunov 2005-02-08 17:17:42 Re: Creating an index-type for LIKE '%value%'
Previous Message Oleg Bartunov 2005-02-08 17:00:44 Re: Creating an index-type for LIKE '%value%'