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From "Tanguy Moal (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (LUCENE-4063) FrenchLightStemmer performs abusive compression of (arbitrary) repeated characters in long tokens
Date Fri, 01 Jun 2012 13:55:23 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13287408#comment-13287408
] 

Tanguy Moal edited comment on LUCENE-4063 at 6/1/12 1:55 PM:
-------------------------------------------------------------

I agree with both of you, it sounds like a design change.

I think Jacques Savoy's algorithm was intended to be used on words. Not on numbers, or mixes
of both (like in 22h00).

Which is true for any stemmer, I think. That's why on the mailing I also suggested we could
have each stemmer share a common interface that would filter non-stemmable literals out of
the way. That could prevent the same issue to rise from a different stemming implementation.

I'm just saying this as I think about it.
                
      was (Author: tanguy):
    I agree with both of you, it sounds like a design change.

I think Jacques Savoy's algorithm was intended to be used on words. Not on numbers, or mixes
of both (like in 22h00).

Which is true for any stemmer, I think. That's why on the mailing I also suggested we could
have each stemmer share a common interface that would filter non-stemmable literals out of
the way. That could prevent the same issue to raise from a different stemming implementation.

I'm just saying this as I think about it.
                  
> FrenchLightStemmer performs abusive compression of (arbitrary) repeated characters in
long tokens
> -------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-4063
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4063
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: modules/analysis
>    Affects Versions: 3.4, 4.0
>            Reporter: Tanguy Moal
>            Assignee: Steven Rowe
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: LUCENE-4063.patch, SOLR-3463.patch, SOLR-3463.patch, SOLR-3463.patch
>
>
> FrenchLightStemmer performs aggressive deletions on repeated character sequences, even
on numbers.
> This might be unexpected during full text search.

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