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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-329) Fuzzy query scoring issues
Date Thu, 27 Jan 2011 15:23:29 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12987598#action_12987598
] 

Uwe Schindler commented on LUCENE-329:
--------------------------------------

I agree with your complaints, but this issue was more about MTQ queries at all and strange
scoring. So FuzzyQuery behaves now more as one would expect. We already have different variants
of this query like FuzzyLikeThis that also solve this issue.

This is why I closed the issue.

> Fuzzy query scoring issues
> --------------------------
>
>                 Key: LUCENE-329
>                 URL: https://issues.apache.org/jira/browse/LUCENE-329
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Search
>    Affects Versions: 1.2rc5
>         Environment: Operating System: All
> Platform: All
>            Reporter: Mark Harwood
>            Priority: Minor
>             Fix For: 3.1, 4.0
>
>         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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