Re: Avoiding empty queries in tsearch

Doug Cole wrote:
> That sounds perfect, but it doesn't seem to exist on either of the
> postgresql installations I have access to (8.1 on ubuntu and fedora
> core). Is it new to 8.2? Is there a similar function under 8.1, or at
Yes, it's new in 8.2

> least a decent work-around? Thanks for the help,
> Doug

Not nice workaround but it works:

# create or replace function isvoid(tsquery)
returns bool as $$
select case when $1 is NULL then 't'::bool when length(textin(tsquery_out( $1
))) = 0 then 't'::bool else 'f'::bool end;
$$ language SQL called on null input;

# select isvoid( plainto_tsquery('the & any') );
NOTICE: query contains only stopword(s) or doesn't contain lexeme(s), ignored
isvoid
--------
t
(1 row)

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Teodor Sigaev E-mail: teodor(at)sigaev(dot)ru
WWW: http://www.sigaev.ru/