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https://issues.apache.org/jira/browse/LUCENE-2102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784414#action_12784414
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Robert Muir commented on LUCENE-2102:
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I have one comment, that this will not work correctly on text that is not NFC.
This is because uppercase I with dot can be represented as \u0130 (as you
handle it), but also decomposed as \u0049 + \u0307. There can also be stuff in
between technically...
after finding a regular I (\u0049) we could search ahead for COMBINING DOT
ABOVE (ignoring any nonspacing marks and format and such along the way), and
handle this differently.
but non-NFC text doesn't work correctly throughout most of lucene's analysis
components as it is now anyway, so I don't think we should worry about it right
now. Maybe we could add a comment for the future though.
> 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
>
>
> 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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