[jira] Commented: (LUCENE-2067) Czech Stemmer

["Simon Willnauer (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-2067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12777894#action_12777894 ] 

Simon Willnauer commented on LUCENE-2067:
-----------------------------------------

Good stuff Robert!
You might wanna link to https://issues.apache.org/jira/browse/LUCENE-2034 and subclass the StopawareAnalyzer.

btw. we could also rename it to SmartCzechAnalyzer :)

> 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
>
>
> 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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