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Date: Wed, 3 Feb 2010 14:25:27 +0000 (UTC)
From: "Robert Muir (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Updated: (LUCENE-2055) Fix buggy stemmers and Remove
 duplicate analysis functionality
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     [ https://issues.apache.org/jira/browse/LUCENE-2055?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Muir updated LUCENE-2055:
--------------------------------

    Attachment: LUCENE-2055.patch

updated patch:
* implement StemmerOverrideFilter with CharArrayMap
* fix casing problems in french and dutch: they did not call lowercasefilter, instead relying upon the stemmer to lowercase things. this causes inconsistencies with stopwords, dictionary-based stemming, exclusion sets, you name it. the old broken behavior is preserved depending on Version
* add missing standardfilter to greek (depending on Version).


> Fix buggy stemmers and Remove duplicate analysis functionality
> --------------------------------------------------------------
>
>                 Key: LUCENE-2055
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2055
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: contrib/analyzers
>            Reporter: Robert Muir
>             Fix For: 3.1
>
>         Attachments: LUCENE-2055.patch, LUCENE-2055.patch, LUCENE-2055.patch
>
>
> would like to remove stemmers in the following packages, and instead in their analyzers use a SnowballStemFilter instead.
> * analyzers/fr
> * analyzers/nl
> * analyzers/ru
> below are excerpts from this code where they proudly proclaim they use the snowball algorithm.
> I think we should delete all of this custom stemming code in favor of the actual snowball package.
> {noformat}
> /**
>  * A stemmer for French words. 
>  * <p>
>  * The algorithm is based on the work of
>  * Dr Martin Porter on his snowball project<br>
>  * refer to http://snowball.sourceforge.net/french/stemmer.html<br>
>  * (French stemming algorithm) for details
>  * </p>
>  */
> public class FrenchStemmer {
> /**
>  * A stemmer for Dutch words. 
>  * <p>
>  * The algorithm is an implementation of
>  * the <a href="http://snowball.tartarus.org/algorithms/dutch/stemmer.html">dutch stemming</a>
>  * algorithm in Martin Porter's snowball project.
>  * </p>
>  */
> public class DutchStemmer {
> /**
>  * Russian stemming algorithm implementation (see http://snowball.sourceforge.net for detailed description).
>  */
> class RussianStemmer
> {noformat}

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