Re: Mailing list search engine: surprising missing results?

On Mon, Jan 24, 2022 at 08:27:41AM +0100, Laurenz Albe wrote:
> On Sun, 2022-01-23 at 12:49 +0000, James Addison wrote:
> > Specializing the query further and searching for
> > "boyer-moore-horspool"[4] *does* again return results -- two documents
> > -- with the terms "boyer" and "horspool" highlighted.
>
> This is caused by the peculiarities of PostgreSQL full text search:
>
> SELECT to_tsvector('english', 'Boyer-Moore-Horspool')
> @@ websearch_to_tsquery('english', 'boyer-moore');
>
> ?column?
> ══════════
> f
> (1 row)
>
> The reason is that the 'moore' in 'boyer-moore' is stemmed, since it
> is at the end of the word, while the 'moore' in 'Boyer-Moore-Horspool'
> isn't:

Wow, he showed me this problem earlier but I never suspected it was
stemming issue because I never considered proper nowns could be
stem-adjusted, but it is obvious they can.

--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com

If only the physical world exists, free will is an illusion.