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Message-ID: <32dca9ed0509280758f0e6d10@mail.gmail.com>
Date: Wed, 28 Sep 2005 10:58:54 -0400
From: Andy Liu <andyliu1227@gmail.com>
Reply-To: Andy Liu <andyliu1227@gmail.com>
To: java-user@lucene.apache.org
Subject: Re: A very technical question.
In-Reply-To: <433AA7AD.3070204@cs.put.poznan.pl>
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References: <433AA7AD.3070204@cs.put.poznan.pl>

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While you're indexing, you can assign each doc with a field that refers to
how long the document is. So, for example, you can add a field named
"docLength" for each document, and assign it with discrete values such as
"veryshort", "short", "medium", "long", "verylong", depending on how
granular you need it. Then at query time you can specify the field and a
given boost value, i.e.

civil war docLength:verylong^5 docLength:long^3

Andy

On 9/28/05, Dawid Weiss <dawid.weiss@cs.put.poznan.pl> wrote:
>
>
> Hi.
>
> I have a very technical question. I need to alter document score (or in
> fact: document boosts) for an existing index, but for each query. In
> other words, I'd like these to have pseudo-queries of the form:
>
> 1. civil war PREFER:shorter
> 2. civil war PREFER:longer
>
> for these two queries, 1. would score shorter documents higher then
> option 2, which would in turn score longer documents higher. Note that
> these preferences can be expressed at query time, so static document
> boosts are of little help.
>
> I'd appreciate if those familiar with the internals of Lucene gave me
> brief instructions on how this could be achieved (my rough guess is that
> I'll need to build my own Scorer... but how to access document length
> and where to plug in that scorer... besides I'd rather hear it from
> somebody with more expertise).
>
> Thanks,
> D.
>
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--
Andy Liu
andyliu1227@gmail.com
(301) 873-8458

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