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From: Grant Ingersoll <gsingers@apache.org>
Subject: Re: Rank based on lists.
Date: Mon, 13 Aug 2007 22:34:31 -0400
To: java-user@lucene.apache.org

Have a look at the DisjunctionMaxQuery class.  I don't think it is  
exactly what you are looking for, but it might give you some ideas on  
how to proceed, as it sounds similar to what you are trying to do.

Hope this helps,
Grant

On Aug 13, 2007, at 2:20 PM, Walt Stoneburner wrote:

> Here's a scenario I just ran into, though I don't know how to make
> Lucene do it (or even if it can).
>
> I have two lists; to keep things simply lets assume (A B C D E F G)  
> and (X Y).
>
> I want to form a query so that when matches appear from both lists,
> results rank higher, than if many elements matched from just one.
>
> That is, a document that matches a many terms of list one, such as A B
> C D E F, ranks lower than a document that matches just one term from
> each list, A X.
>
> It is not the case that the second list weights more.  It's just as
> equal as the first.
>
> So, for instance, a match of X Y, all of list two, would rank less
> than a match of A X, which had hits in both.
>
>
> Is this even possible, or does Lucene not have facilities for lists,
> sets, groups, or whatever makes sense to call them?
>
> -Walt Stoneburner, wls@wwco.com
>  http://www.wwco.com/~wls/blog/
>
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--------------------------
Grant Ingersoll
http://lucene.grantingersoll.com

Lucene Helpful Hints:
http://wiki.apache.org/lucene-java/BasicsOfPerformance
http://wiki.apache.org/lucene-java/LuceneFAQ


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