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From Peter 4U <pete...@hotmail.com>
Subject RE: Top field count scoring across documents
Date Sun, 22 Nov 2009 17:45:30 GMT

Hi Jake,

 

Many thanks for your quick reply.

I shall check these out.

 

Thanks!

Peter


 
> Date: Sun, 22 Nov 2009 09:20:24 -0800
> Subject: Re: Top field count scoring across documents
> From: jake.mannix@gmail.com
> To: java-user@lucene.apache.org
> 
> Peter,
> 
> You want to do a facet query. This kind of functionality is not in
> Lucene-core (sadly), but both Solr (the fully featured search application
> built on Lucene) and bobo-browse (just a library, like Lucene itself) are
> open-source and work with Lucene to provide faceting capabilities for you.
> 
> -jake
> 
> On Sun, Nov 22, 2009 at 8:42 AM, Peter 4U <peter4u@hotmail.com> wrote:
> 
> >
> > Hello Lucene Experts,
> >
> > I wonder if someone might be able to shed some insight on this interesting
> > scoring question:
> >
> > The problem:
> > Build a search query that will return [ordered] hits by the top number of
> > occurences of field values across matched documents (or as close to this as
> > possible).
> > The built-in scoring is great for scoring number of hits within a document,
> > but is there an efficient way to do this across the same field in a set of
> > matched documents? (maybe scoring isn't the best way?)
> >
> > Example:
> > Let's say you have an index containing book information. Each document has
> > a 'title' field.
> > Let's say the index contains 100 entries, with:
> > 65 'title's containing the word 'tiger'
> > 21 containing 'lion'
> > 6 containing 'panther'
> > 5 containing 'kitten'
> > 3 containing 'slug'
> >
> > What would be the best way to build a query such that returned documents
> > are ordered in this way:
> > Rank Value Occurences
> > ================================
> > 1 tiger 65
> > 2 lion 21
> > 3 panther 6
> > 4 kitten 5
> > 5 slug 3
> >
> > I can, of course, build a standard query, traverse the returned documents
> > and build such a list, but if the returned query had many 100,000's of hits,
> > the performance would degrade linearly, particularly if only the 'Top 5' are
> > actually required.
> >
> >
> > One idea is to maintain a separate index with this information - the main
> > problem with this is that you essentially need to know what you're searching
> > for at index-time, which isn't ideal.
> >
> >
> > Has anyone come across and solved this particular issue using Lucene?
> >
> > Many thanks,
> > Peter
> >
> >
> >
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