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From: Frode Bjerkholt <fb@mtouch.no>
Organization: mTouch AS
To: java-user@lucene.apache.org
Subject: Different boost values for different terms in a field.
Date: Thu, 5 Oct 2006 10:10:43 +0200
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Message-Id: <200610051010.43200.fb@mtouch.no>

Hi

My intention is to give different terms in a field different boost values.

The queries from a use perspective, will be one fulltext input field.

The following code illustrates this:

Field f1 = new Field("name", "John", Field.Store.NO, Field.Index.TOKENIZED);
Field f2 = new Field("name", "Doe", Field.Store.NO, Field.Index.TOKENIZED);

f1.setBoost(1.0f);
f2.setBoost(2.0f);

doc.add(f1);
doc.add(f2);

In the current version of Lucene, as far as I now, this does not work - 
Allthough it would have been a very powerful feature. 

The current solution is to make a firstname field and a lastname field, and 
then make a complex query like this:

Input: Eric Doe

(firstname:Eric OR lastname:Eric^2) AND (firstname:Doe OR lastname:Doe^2)

The performance of such a query is quite slow, and it becomes even worse when 
you have more than two fields and/or more words in the input string.

My questions:

1. Is there a better/faster solution to accomplish such a query?

2. Would it be possible to implement the described feature in a future version 
of Lucene?

-- 
Best Regards,

Frode

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