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From: Laurenz Albe <[email protected]>
To: Oleg Bartunov <[email protected]>
To: Tom Lane <[email protected]>
Cc: Bruce Momjian <[email protected]>
Cc: James Addison <[email protected]>
Cc: PostgreSQL WWW <[email protected]>
Subject: Re: Mailing list search engine: surprising missing results?
Date: Tue, 25 Jan 2022 13:43:48 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAF4Au4yttKJ1KAP-cO+HMLQ2_66vmx0dLTBUbE4W8Aa64foafg@mail.gmail.com>
References: <CALDQ5NxzgeXHRCD4dS_6qz+nn01ivi3i1ZEtD2DmC779i0=iSQ@mail.gmail.com>
	<[email protected]>
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	<CAF4Au4yttKJ1KAP-cO+HMLQ2_66vmx0dLTBUbE4W8Aa64foafg@mail.gmail.com>

On Tue, 2022-01-25 at 14:04 +0300, Oleg Bartunov wrote:
> On Mon, Jan 24, 2022 at 11:47 PM Tom Lane <[email protected]> wrote:
> > Bruce Momjian <[email protected]> writes:
> > > On Mon, Jan 24, 2022 at 08:27:41AM +0100, Laurenz Albe wrote:
> > > > 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.
> > 
> > I wonder if we should change that so that components of a compound
> > word are consistently stemmed the same way.
>
> Something like this
> 
> SELECT to_tsvector('english', 'Boyer-Moore-Horspool');
>                        to_tsvector
> ----------------------------------------------------------
>  'boyer':2 'boyer-moore-horspool':1 'boyer-moore':1  'moore-horspool':1  'horspool':4 'moor':3
> (1 row)

Not quite.  The problem is question is the "'boyer-moore':1".
If that were "'boyer-moor':1" instead, the problem would disappear.

Yours,
Laurenz Albe

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