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Date: Tue, 23 Nov 2004 16:31:14 -0800
From: Ken McCracken <ken.mccracken@gmail.com>
Reply-To: Ken McCracken <ken.mccracken@gmail.com>
To: Lucene Users List <lucene-user@jakarta.apache.org>
Subject: Re: lucene Scorers
In-Reply-To: <200411131207.05478.paul.elschot@xs4all.nl>
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References: 
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	 <200411131207.05478.paul.elschot@xs4all.nl>

Hi,

Thanks the pointers in your replies.  Would it be possible to include
some sort of accrual scorer interface somewhere in the Lucene Query
APIs?  This could be passed into a query similar to
MaxDisjunctionQuery; and combine the sum, max, tieBreaker, etc.,
according to the implementor's discretion, to compute the overall
score for a document.

-Ken

On Sat, 13 Nov 2004 12:07:05 +0100, Paul Elschot <paul.elschot@xs4all.nl> wrote:
> On Friday 12 November 2004 22:56, Chuck Williams wrote:
> 
> 
> > I had a similar need and wrote MaxDisjunctionQuery and
> > MaxDisjunctionScorer.  Unfortunately these are not available as a patch
> > but I've included the original message below that has the code (modulo
> > line breaks added by simple text email format).
> >
> > This code is functional -- I use it in my app.  It is optimized for its
> > stated use, which involves a small number of clauses.  You'd want to
> > improve the incremental sorting (e.g., using the bucket technique of
> > BooleanQuery) if you need it for large numbers of clauses.
> 
> When you're interested, you can also have a look here for
> yet another DisjunctionScorer:
> http://issues.apache.org/bugzilla/show_bug.cgi?id=31785
> 
> It has the advantage that it implements skipTo() so that it can
> be used as a subscorer of ConjunctionScorer, ie. it can be
> faster in situations like this:
> 
> aa AND (bb OR cc)
> 
> where bb and cc are treated by the DisjunctionScorer.
> When aa is a filter this can also be used to implement
> a filtering query.
> 
> 
> 
> 
> > Re. Paul's suggested steps below, I did not integrate this with query
> > parser as I didn't need that functionality (since I'm generating the
> > multi-field expansions for which max is a much better scoring choice
> > than sum).
> >
> > Chuck
> >
> > Included message:
> >
> > -----Original Message-----
> > From: Chuck Williams [mailto:chuck@manawiz.com]
> > Sent: Monday, October 11, 2004 9:55 PM
> > To: lucene-dev@jakarta.apache.org
> > Subject: Contribution: better multi-field searching
> >
> > The files included below (MaxDisjunctionQuery.java and
> > MaxDisjunctionScorer.java) provide a new mechanism for searching across
> > multiple fields.
> 
> The maximum indeed works well, also when the fields differ a lot length.
> 
> Regards,
> Paul
> 
> 
> 
> 
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