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From "Thomas Morton (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-1548) LevenshteinDistance code normalization is incorrect
Date Thu, 26 Feb 2009 02:25:01 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-1548?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Thomas Morton updated LUCENE-1548:
----------------------------------

    Attachment: LUCENE-1548.patch

Fixes issue (changes min to max in distance computation) and corrects unit tests.

> LevenshteinDistance code normalization is incorrect
> ---------------------------------------------------
>
>                 Key: LUCENE-1548
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1548
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: contrib/spellchecker
>    Affects Versions: 2.3, 2.3.1, 2.3.2, 2.4
>            Reporter: Thomas Morton
>            Priority: Minor
>             Fix For: 2.4.1
>
>         Attachments: LUCENE-1548.patch
>
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
>
> The normalization of the edit distance should use the maximum of the two string being
compared instead of the minimum.  Otherwise negative distances are possible.  The spell checker
filters out edits below a certain threshold so this hasn't been a problem in practice.

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