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https://issues.apache.org/jira/browse/LUCENE-329?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Harwood updated LUCENE-329:
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Attachment: LUCENE-329.patch
New patch addressing this long-standing bug.
Addresses the all-or-nothing choices of today where the default is a (poor) use
of all IDF factors or a sub-optimal alternative of using a rewrite method with
no IDF.
The patch includes:
1) A new default FuzzyQuery rewrite method that balances IDF better
2) Unit tests for single and multi-query behaviours
Additionally, this document offers more analysis based on quality tests on a
slightly larger set of data not included here:
https://docs.google.com/document/d/1KXhbUpD5GFyzNqfk3nocODOo7Upgpd5tmUQp4-OPwiM/edit#heading=h.2e8gdmdqf2m5
> Fuzzy query scoring issues
> --------------------------
>
> Key: LUCENE-329
> URL: https://issues.apache.org/jira/browse/LUCENE-329
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/search
> Affects Versions: 1.2
> Environment: Operating System: All
> Platform: All
> Reporter: Mark Harwood
> Assignee: Mark Harwood
> Priority: Minor
> Fix For: 3.1, 4.0-ALPHA
>
> Attachments: ASF.LICENSE.NOT.GRANTED--patch.txt, LUCENE-329.patch
>
>
> 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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