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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2067) Czech Stemmer
Date Mon, 16 Nov 2009 15:11:39 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2067?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Muir updated LUCENE-2067:
--------------------------------

    Attachment: LUCENE-2067.patch

updated patch, fixed to use Version.LUCENE_31.

I also added a note that this StemFilter expects input to be in lowercase already, but wants
the diacritical marks to still be there.
If you want to ascii fold do it after stemming.


> Czech Stemmer
> -------------
>
>                 Key: LUCENE-2067
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2067
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: contrib/analyzers
>            Reporter: Robert Muir
>            Priority: Minor
>             Fix For: 3.1
>
>         Attachments: LUCENE-2067.patch, LUCENE-2067.patch
>
>
> Currently, the CzechAnalyzer is merely stopwords, and there isn't a czech stemmer in
snowball.
> This patch implements the light stemming algorithm described in: http://portal.acm.org/citation.cfm?id=1598600
> In their measurements, it improves MAP 42%
> The analyzer does not use this stemmer if LUCENE_VERSION <= 3.0, for back compat.

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