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Date: Mon, 26 Mar 2012 16:44:27 +0000 (UTC)
From: "Mark Miller (Updated) (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (SOLR-3231) Add the ability to KStemmer to
 preserve the original token when stemming
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     [ https://issues.apache.org/jira/browse/SOLR-3231?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mark Miller updated SOLR-3231:
------------------------------

    Affects Version/s:     (was: 4.0)
        Fix Version/s: 4.0
    
> Add the ability to KStemmer to preserve the original token when stemming
> ------------------------------------------------------------------------
>
>                 Key: SOLR-3231
>                 URL: https://issues.apache.org/jira/browse/SOLR-3231
>             Project: Solr
>          Issue Type: Improvement
>          Components: Schema and Analysis
>            Reporter: Jamie Johnson
>             Fix For: 4.0
>
>         Attachments: KStemFilter.patch
>
>
> While using the PorterStemmer, I found that there were often times that it was far to aggressive in it's stemming.  In my particular case it is unrealistic to provide a protected word list which captures all possible words which should not be stemmed.  To avoid this I proposed a solution whereby we store the original token as well as the stemmed token so exact searches would always work.  Based on discussions on the mailing list Ahmet Arslan, I believe the attached patch to KStemmer provides the desired capabilities through a configuration parameter.  This largely is a copy of the org.apache.lucene.wordnet.SynonymTokenFilter.  

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