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https://issues.apache.org/jira/browse/LUCENE-2094?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer updated LUCENE-2094:
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Attachment: LUCENE-2094.patch
This patch uses CharacterUtils and Version to preserve backwards compatibility.
It has grown to a very large patch and changes a lot of stuff in core too. I'm
not sure if this is the best way to go with the limited usecase in mind. - Only
Deseret language has upper / lowercase pairs which are not in the BMP. Yet this
could change in the future - who knows that way we could get rid of the
deprecated methodes little quicker...
>From a backwards policy perspective we should do it that way.
> 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.patch, 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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