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https://issues.apache.org/jira/browse/LUCENE-2094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12782009#action_12782009
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Robert Muir commented on LUCENE-2094:
-------------------------------------
Simon, yeah. its tricky you know, like many suppl. char issues.
even if we provide perfect backwards compatibility with what 3.0 did, if you
care about these languages, you *WANT* to reindex, because stuff wasn't working
at all before.
and if you really care, you weren't using any of lucene's analysis components
anyway (except maybe WhitespaceTokenizer).
For example, StandardAnalyzer currently discards these characters anyway.
but we don't want to screw over CJK users where things might have been "mostly"
working before, either.
In this case, CJK is completely unaffected, I think we should not use version
here or in any other lowercasing fixes, including LowerCaseFilter itself.
> Prepare CharArraySet for Unicode 4.0
> ------------------------------------
>
> Key: LUCENE-2094
> URL: https://issues.apache.org/jira/browse/LUCENE-2094
> Project: Lucene - Java
> Issue Type: Bug
> Components: Analysis
> Affects Versions: 1.9, 2.0.0, 2.1, 2.2, 2.3, 2.3.1, 2.3.2, 2.3.3, 2.4,
> 2.4.1, 2.4.2, 2.9, 2.9.1, 2.9.2, 3.0, 3.0.1, 3.1
> Reporter: Simon Willnauer
> Fix For: 3.1
>
> Attachments: LUCENE-2094.txt, LUCENE-2094.txt, LUCENE-2094.txt
>
>
> CharArraySet does lowercaseing if created with the correspondent flag. This
> causes that String / char[] with uncode 4 chars which are in the set can not
> be retrieved in "ignorecase" mode.
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