Re: turning a tsvector without position in a weighted tsvector

On Mon, 8 Feb 2010 23:01:45 +0300 (MSK)
Oleg Bartunov <oleg@sai.msu.su> wrote:

> Ivan,
>
> what's wrong with:
>
> postgres=# select 'abc:1'::tsvector;
>   tsvector
> ----------
>   'abc':1

Yes you're right. I think I misplaced some quotes.
But still, once a vector has no position, I can't add the weights.

test=# select setweight('tano'::tsvector, 'A');
 setweight
-----------
 'tano'
(1 row)

test=# select setweight('tano:1'::tsvector, 'A');
 setweight
-----------
 'tano':1A
(1 row)

Since I'm writing some helper to manipulate tsvectors I was
wondering if
a) there is any reasonable use case of adding weights to
vectors with no position
b) I missed any obvious way to add weights to tsvectors that were
initially without positions

thanks

--
Ivan Sergio Borgonovo
http://www.webthatworks.it