Re: How to drop all tokens that a snowball dictionary cannot stem?

On Sat, Nov 23, 2019 at 10:42 AM Christoph Gößmann <[email protected]>
wrote:

> Hi Jeff,
>
> You're right about that point. Let me redefine. I would like to drop all
> tokens which neither are the stemmed or unstemmed version of a known word.
> Would there be the possibility of putting a wordlist as a filter ahead of
> the stemming? Or do you know about a good English lexeme list that could be
> used to filter after stemming?
>

I think what you describe is the opposite of what snowball was designed to
do.  You want an ispell-based dictionary instead.

PostgreSQL doesn't ship with real ispell dictionaries, so you have to
retrieve the files yourself and install them into $SHAREDIR/tsearch_data as
described in the docs for
https://www.postgresql.org/docs/12/textsearch-dictionaries.html#TEXTSEARCH-ISPELL-DICTIONARY

Cheers,

Jeff