BUG #16146: ts_headline does not find phrase matches correctly

PG Bug reporting form <[email protected]> Wed, 04 Dec 2019 08:39:48 +0000

Newsgroups	gmane.comp.db.postgresql.bugs
Message-ID	<[email protected]>

The following bug has been logged on the website:

Bug reference:      16146
Logged by:          Augustinas Jokubauskas
Email address:      [email protected]
PostgreSQL version: 12.0
Operating system:   Ubuntu 18.04.3
Description:        

When query:
```
select ts_headline(
    $$Lorem ipsum urna.  Nullam  nullam ullamcorper urna.$$,
    to_tsquery('Lorem') && phraseto_tsquery('ullamcorper urna'),
    'StartSel=#$#, StopSel=#$#, FragmentDelimiter=$#$, MaxFragments=100,
MaxWords=100, MinWords=1'
);
```
is ran, a fragment of
> Lorem ipsum urna.  Nullam  nullam ullamcorper urna.
should be returned, however, the result is a single word of #$#Lorem#$# is
returned, meaning that ts_headline did not find the queried string.