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https://issues.apache.org/jira/browse/LUCENE-2102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784476#action_12784476
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Robert Muir commented on LUCENE-2102:
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bq. One othe possibility to resolve the problem in a completely different way:
You could wrap a MappingCharFilter on top of the input reader in Analyzer and
just add a replacement for this one char:
Uwe, but this is inflexible. If we want to make this filter support turkish
lowercasing in the future for all of unicode, not just NFC composed form, we
cannot do it with MappingCharFilter. Again I don't think we should fix this
now, but in the future I think we might want to.
> 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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