[jira] [Resolved] (LUCENE-3110) ASCIIFoldingFilter wrongly folds german Umlauts

["Steven Rowe (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-3110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Rowe resolved LUCENE-3110.
---------------------------------

    Resolution: Won't Fix

See LUCENE-1696, where Robert Muir advocates using an ICU collation filter instead of locale-sensitive 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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