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From: =?iso-8859-1?Q?Gon=E7alo_Gaiolas?= <goncalo.gaiolas@outsystems.com>
To: <java-user@lucene.apache.org>
Subject: RE: Scoring based on fields and categorization
Date: Tue, 5 Sep 2006 13:32:36 +0100
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In-Reply-To: <1157458197.4933.13.camel@localhost>

Hi Karl,

Thanks for the super quick response!

One question - should this boosting occur during index time or at query
time? I'm a bit confused as to where should I apply this boost in order =
to
affect the results of a search query.

Once again thanks a lot!

Gon=E7alo

-----Original Message-----
From: karl wettin [mailto:karl.wettin@gmail.com]=20
Sent: ter=E7a-feira, 5 de Setembro de 2006 13:10
To: java-user@lucene.apache.org
Subject: Re: Scoring based on fields and categorization

On Tue, 2006-09-05 at 11:54 +0100, Gon=E7alo Gaiolas wrote:
> -          Scoring should take in consideration not only the relevance =
of
> the contents, but also two numerical values in other document fields. =
For
> example, let=92s assume that the normal score for Document A is 0.33 =
(as
> calculated by Lucene). What I need is that it=92s true score is 0.33 *
(value
> of field A) * (value of field B). What is the best way to accomplish =
this?
> I=92ve read that changing the scoring algorithm is difficult and =
painful.=20

Indeed you want to stay off the scoring algorithm if you can. It is
probably much eaiser for you to just boost the document based on the
values you have:=20

http://lucene.apache.org/java/docs/api/org/apache/lucene/document/Documen=
t.h
tml#setBoost(float)


> -          I need to make sure only one document per Category is
retrieved.
> Categories are also implemented as index fields. So, for example, if =
my
> search yields two documents with the same Category (let=92s assume =
Movies),
> only the higher scoring document is returned. I=92m assuming the =
easiest way
> to implement this is post-processing the fetching process, maybe with =
a
> HitCollector?

Yes, in most cases that would be the way to go.


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