Re: Phrase search distance syntax

On Fri, Sep 23, 2016 at 05:07:26PM +0300, Teodor Sigaev wrote:
> >Sorry to be asking another phrase search syntax question, and so close
> >to final release, but ...
> Really close...
> >
> >Why does the phrase distance operator assume <1> means adjacent words,
> >and not <0>.  (FYI, <-> is the same as <1>.)
> Because
> 1 it is a result of subtruction of word's positions
> 2 <0> could be used as special case like a word with two infinitives:
> # create text search dictionary xx (template = 'ispell',
> DictFile='ispell_sample', AffFile='ispell_sample');
> # alter text search configuration english ALTER MAPPING FOR asciiword WITH
> xx, english_stem;
> 
> # select to_tsvector('english', 'bookings');
>      to_tsvector
> ----------------------
>  'book':1 'booking':1
> 
> # select to_tsvector('english', 'bookings') @@ 'book <0> booking';
>  ?column?
> ----------
>  t
> (1 row)

OK, thanks.  I just found it as unusual.

--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://enterprisedb.com

+ As you are, so once was I. As I am, so you will be. +
+                     Ancient Roman grave inscription +