Pierre,
you, probably, can use custom configuration, which uses pg_3chars
dictionary.
Oleg
On Mon, 30 Jun 2008, Pierre Thibaudeau wrote:
2008/6/30 Oleg Bartunov <oleg@xxxxxxxxxx>:
tsearch will have prefix search support in 8.4.
Thanks Oleg! That's fantastic news!
In the meantime, carrying on with my earlier idea, here's the little
function I came up with for extracting the 3-char-lexeme tsvector, in
case anyone's interested:
CREATE OR REPLACE FUNCTION public.to_three_char_tsvector(str text)
RETURNS tsvector AS
$BODY$declare
somerow record;
shortened_text text := '';
BEGIN
FOR somerow IN SELECT regexp_split_to_table(trim(both '\'' from
strip(to_tsvector('simple',str))::text),'\'') AS item LOOP
shortened_text := shortened_text || ' ' ||
COALESCE(substring(somerow.item for 3), '');
END LOOP;
RETURN strip(to_tsvector(shortened_text));
END;$BODY$
LANGUAGE 'plpgsql' IMMUTABLE;
Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@xxxxxxxxxx, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83
