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)



--
Teodor Sigaev                                   E-mail: teodor@sigaev.ru
                                                    WWW: http://www.sigaev.ru/