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From "Mark Harwood (JIRA)" <>
Subject [jira] Commented: (LUCENE-329) Fuzzy query scoring issues
Date Thu, 22 Sep 2005 19:45:34 GMT
    [ ] 

Mark Harwood commented on LUCENE-329:

This has been partially addressed. 

Issue 1, the coord factor has been rectified with the introduction of new constructor BooleanQuery(boolean

Issue 2 (idf ranking) has not been addressed. 

> Fuzzy query scoring issues
> --------------------------
>          Key: LUCENE-329
>          URL:
>      Project: Lucene - Java
>         Type: Bug
>   Components: Search
>     Versions: 1.2rc5
>  Environment: Operating System: All
> Platform: All
>     Reporter: Mark Harwood
>     Assignee: Lucene Developers
>  Attachments: patch.txt
> Queries which automatically produce multiple terms (wildcard, range, prefix, 
> fuzzy etc)currently suffer from two problems:
> 1) Scores for matching documents are significantly smaller than term queries 
> because of the volume of terms introduced (A match on query Foo~ is 0.1 
> whereas a match on query Foo is 1).
> 2) The rarer forms of expanded terms are favoured over those of more common 
> forms because of the IDF. When using Fuzzy queries for example, rare mis-
> spellings typically appear in results before the more common correct spellings.
> I will attach a patch that corrects the issues identified above by 
> 1) Overriding Similarity.coord to counteract the downplaying of scores 
> introduced by expanding terms.
> 2) Taking the IDF factor of the most common form of expanded terms as the 
> basis of scoring all other expanded terms.

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