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https://issues.apache.org/jira/browse/LUCENE-2102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784496#action_12784496
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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: https://issues.apache.org/jira/browse/LUCENE-2102
>             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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