Re: Weird ranking results with ts_rank

[Jeff Janes <jeff.janes@xxxxxxxxx>]

On Fri, Nov 15, 2019 at 1:31 AM Javier Ayres <jayres@xxxxxxxxxxxxx> wrote:

Hi everybody. 

I'm implementing a solution that uses PostgreSQL's full text search capabilities and I have come across a particular set of results for ts_rank that don't seem to make sense according to the documentation.

While the documentation doesn't come out and say, my interpretation is that ts_rank assumes there is a match in the first place, and by implication is undefined/unspecified if there is no match.  

select to_tsvector('search for a text box') @@ to_tsquery('circle | lot <-> box');
 ?column?
----------
 f
(1 row)

 

Cheers,

Jeff