With AND, _all_ clauses are required, not just most. With OR, the
idea is to reward documents that match more clauses.
Erik
On Mar 9, 2008, at 1:38 PM, Ghinwa Choueiter wrote:
but shouldn't the coord factor kick in with AND instead of OR? I
understand why you would want to use coord in the case of AND,
where you reward more the documents that contain most of the terms
in the query. However in the case of OR, it should not matter if
all the OR operands are in the document?
-Ghinwa
----- Original Message ----- From: "Erik Hatcher"
<[EMAIL PROTECTED]>
To: <java-user@lucene.apache.org>
Sent: Sunday, March 09, 2008 1:22 PM
Subject: Re: Scoring a query with OR's
On Mar 9, 2008, at 12:39 PM, Ghinwa Choueiter wrote:
but what exactly happens when there are OR's, for eg. (life OR
place OR time)
The scoring equation can get a score for life, place, time
separately, but what does it do with them then? Does it also add
them.
The coord factor kicks in then:
<http://hudson.zones.apache.org/hudson/job/Lucene-trunk/javadoc//
org/ apache/lucene/search/DefaultSimilarity.html#coord(int,%20int)>
the formula listed here should help too:
<http://hudson.zones.apache.org/hudson/job/Lucene-trunk/javadoc//
org/ apache/lucene/search/Similarity.html>
Erik
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