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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3110) ASCIIFoldingFilter wrongly folds german Umlauts
Date Tue, 17 May 2011 11:03:47 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13034709#comment-13034709
] 

Robert Muir commented on LUCENE-3110:
-------------------------------------

Hi,

these characters are not German umlauts. They are unicode characters used
by a number of languages. the purpose of ASCIIFolding is to do simple accent-stripping.

> ASCIIFoldingFilter wrongly folds german Umlauts
> -----------------------------------------------
>
>                 Key: LUCENE-3110
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3110
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: modules/analysis
>    Affects Versions: 3.1
>            Reporter: Michael Gaber
>
> the german umlauts are currently mapped as follows.
> Ä/ä => A/a
> Ö/ö => O/o
> Ü/ü => U/u
> the correct mapping would be
> Ä/ä => Ae/ae
> Ö/ö => Oe/oe
> Ü/ü => Ue/ue
> so the corresponding rows in the switch statement should be moved down to the ae/oe/ue
positions.

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