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From "Uwe Schindler (JIRA)" <>
Subject [jira] Commented: (LUCENE-2102) LowerCaseFilter for Turkish language
Date Tue, 01 Dec 2009 22:53:20 GMT


Uwe Schindler commented on LUCENE-2102:

Robert: I understand your problem, but it affects LowerCaseFilter at all and is not special
to the Turkish lower filter. If you have decomposed characters even LowerCaseFilter would
fail for *all* languages (even German if you compose รค out of a and two dots). In germany
really nobody uses composed chars, I do not lknow how this is in Turkey, but the last time
I was there, they just used the simpliest composed chars (like germans). And for that this
filter works and is a quick fix.

But I give up now.

> LowerCaseFilter for Turkish language
> ------------------------------------
>                 Key: LUCENE-2102
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Analysis
>    Affects Versions: 3.0
>            Reporter: Ahmet Arslan
>            Assignee: Robert Muir
>            Priority: Minor
>             Fix For: 3.1
>         Attachments: LUCENE-2102.patch, LUCENE-2102.patch, LUCENE-2102.patch
> java.lang.Character.toLowerCase() converts 'I' to 'i' however in Turkish alphabet lowercase
of 'I' is not 'i'. It is LATIN SMALL LETTER DOTLESS I.

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