Re: Stemming not working with tsearch2() function

On Mon, 30 Apr 2007, psql psql wrote:

> On 4/30/07, Oleg Bartunov <oleg(at)sai(dot)msu(dot)su> wrote:
>>
>> On Mon, 30 Apr 2007, psql psql wrote:
>>
>> > On 4/30/07, Oleg Bartunov <oleg(at)sai(dot)msu(dot)su> wrote:
>> >>
>> >> On Mon, 30 Apr 2007, psql psql wrote:
>> >>
>> >> > Anyone know why to_tsvector('sausages') might return "sausages" while
>> >> > to_tsvector('default','sausages') correctly returns "sausag"?
>> >> >
>> >> > This is causing me a fairly major headache. I am guessing that the
>> >> > tsearch2() function used in my trigger is not specifying "default"
>> when
>> >> > creating the tsvector since the words be put into the vector are not
>> >> > correctly stemmed (if that is the correct term).
>> >> >
>> >> > I figure this may be something to do with locale settings, other
>> info:
>> >>
>> >> it'is. Read http://www.sai.msu.su/~megera/wiki/Tsearch_V2_Notes
>> >
>> >
>> > Thanks for the link.
>> >
>> > select * from pg_ts_cfg where oid=show_curcfg();
>> > ts_name | prs_name | locale
>> > ---------+----------+-------------
>> > simple | default | en_US.UTF-8
>> >
>> >
>> > That's helped me understand that the default config used by the
>> > tsearch2() function
>> > is not 'default' but 'simple' but I still don't understand why 'simple'
>> is
>> > not working when both default and simple have the same locale set in
>> > pg_ts_cfg
>> > (en_US.UTF-8). Am i missing something?
>>
>> at present, having several configurations matching the same locale leads
>> to unpredictable results. Leave only one.
>> In 8.3 we have special flag to mark fts config
>> which could be selectable as default.
>> http://www.sai.msu.su/~megera/postgres/fts/doc/fts-cfg.html
>
>
> Ah thanks.
> Is tsearch2() hard coded to use 'simple', or could i delete 'simple'
> and just use 'default'
> somehow?
> It's not a big issue if I have to use simple, I will just have to redeploy
> some code that is currently using 'default'.
> Matt.

Matt, just update table to save simple cfg for future

update pg_ts_cfg set locale='some_en_US.UTF-8' where ts_name='simple';

>

Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83