Re: Bug in the documentation - to_tsquery( 'postgres:*' );

Maybe the documentation could say that it is assumed that the database
is configured with
default_text_search_config = 'english'
in the configuration file.

In case of my distribution, the parameter was set to 'pg_catalog.simple'.

/etc/postgresql/<version>/main/postgresql.conf
default_text_search_config = 'pg_catalog.simple'

Jiri

On Wed, Apr 05, 2023 at 08:27:28AM +0000, PG Doc comments form wrote:
> The following documentation comment has been logged on the website:
>
> Page: https://www.postgresql.org/docs/15/index.html
> Description:
>
> There is a bug in the documentation on the link
> https://www.postgresql.org/docs/current/datatype-textsearch.html
>
> postgres does not get stemmed to postgr by :to_tsquery( 'postgres:*' );
> and
> SELECT to_tsvector( 'postgraduate' ) @@ to_tsquery( 'postgres:*' );
> returns f.
>
> I am using PostgreSQL 12.14 but the documentation for PostgreSQL 12 is not
> correct either.
> Here is the output from my system:
> SELECT to_tsvector( 'postgraduate' ), to_tsquery( 'postgres:*' );
> to_tsvector | to_tsquery
> ------------------+--------------
> 'postgraduate':1 | 'postgres':*
> (1 row)
>
> So the below mentioned citation seems to be wrong.
>
>
> Citation:
>
> Note that to_tsquery will process prefixes in the same way as other words,
> which means this comparison returns true:
>
> SELECT to_tsvector( 'postgraduate' ) @@ to_tsquery( 'postgres:*' );
> ?column?
> ----------
> t
>
> because postgres gets stemmed to postgr:
>
> SELECT to_tsvector( 'postgraduate' ), to_tsquery( 'postgres:*' );
> to_tsvector | to_tsquery
> ---------------+------------
> 'postgradu':1 | 'postgr':*
>
> which will match the stemmed form of postgraduate.