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From Barbara Krausz <>
Subject Finding docs which contain at least x of the queryterms
Date Wed, 25 May 2005 11:00:34 GMT


Consider a Query with e.g. 4 terms (t1,t2,t3,t4). I want to retrieve all 
documents which contain at least e.g. 3 of the queryterms. How can I 
implement this?
The first idea is to use BooleanQueries such as
(t1 and t2 and t3 and t4) or (t1 and t2 and t3) or(t1 and t2 and t4) or 
(t1 and t3 and t4).....

But the perfomance is not very good when I have 20 queryterms and I want 
to retrieve all docs which contain at least 15 of the terms.
Can I modify the skipto-algorithm in ConjunctionScorer in order to 
achieve this?


PS: Has anybody written a Statistics-class which says how many term and 
different terms are  in  the index.  And perhaps computes the mean 
length of the documents in the index with the standard deviation?

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