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From Ken McCracken <ken.mccrac...@gmail.com>
Subject Re: lucene Scorers
Date Wed, 24 Nov 2004 00:31:14 GMT
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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