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https://issues.apache.org/jira/browse/LUCENE-2094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12797740#action_12797740
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Yonik Seeley commented on LUCENE-2094:
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I obviously haven't had the chance to keep up with changes in Lucene... but as
part of LUCENE-2195 that caught my eye, I was looking at StopFilter.
In the past, pains were made to keep creation fast - if you passed a
CharArraySet, it would be directly used. It now looks like a new set is
created each time (actually two - a CharArraySet and then an
UnmodifiableCharArraySet). This new behavior also no longer matches the
javadoc for the constructor.
It looks like it was committed as part of this issue, but I can't find any
comments here about either the need to make a copy or the need to make a
unmodifiable set.
> 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: 3.0
> Reporter: Simon Willnauer
> Assignee: Uwe Schindler
> Fix For: 3.1
>
> Attachments: LUCENE-2094.patch, LUCENE-2094.patch, LUCENE-2094.patch,
> LUCENE-2094.patch, LUCENE-2094.patch, 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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