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Re: KEEPONLYALNUM for pg_trgm is not documented

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Itagaki Takahiro <itagaki(dot)takahiro(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: KEEPONLYALNUM for pg_trgm is not documented
Date: 2011-09-05 17:25:40
Message-ID: 201109051725.p85HPeG20771@momjian.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Robert Haas wrote:
> On Fri, Mar 11, 2011 at 3:59 AM, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:
> > On Fri, Mar 11, 2011 at 5:52 PM, Itagaki Takahiro
> > <itagaki(dot)takahiro(at)gmail(dot)com> wrote:
> >> contrib/pg_trgm in 9.1 becomes more attractive feature by index supports
> >> for LIKE operators, but only alphabet and numeric characters are indexed
> >> by default. But, we can modify KEEPONLYALNUM in the source code to
> >> keep all characters in n-gram words.
> >>
> >> However, the limitation and KEEPONLYALNUM are not documented in the page:
> >> ?http://developer.postgresql.org/pgdocs/postgres/pgtrgm.html
> >>
> >> An additonal documentation patches acceptable? The issues would be a FAQ for
> >> non-English users. I heard that pg_trgm will be one of the *killer features*
> >> of 9.1 in Japan, where N-gram based text search is preferred.
> >
> > +10
> 
> It's certainly not too late for doc patches.

I have applied the attached documention patch to 9.0, 9.1, and current
to mention that only ascii alphanumeric characters are processed by
contrib/pg_trgm.

-- 
  Bruce Momjian  <bruce(at)momjian(dot)us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +

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