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https://issues.apache.org/jira/browse/LUCENE-4072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13283943#comment-13283943
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Ippei UKAI commented on LUCENE-4072:
------------------------------------
I've backported your additional test case of random string and reproduced the
problem.
However, I haven't managed to pin point the problem so far. Having no clue
coming out of AssertionError, attacking LUCENE-3900 first might be more
productive.
This final offset thing looks like a common occurrence among CharFilters (re
LUCENE-3820 LUCENE-3971) but I'm yet to find a common theme in them.
> CharFilter that Unicode-normalizes input
> ----------------------------------------
>
> Key: LUCENE-4072
> URL: https://issues.apache.org/jira/browse/LUCENE-4072
> Project: Lucene - Java
> Issue Type: New Feature
> Components: modules/analysis
> Reporter: Ippei UKAI
> Attachments: LUCENE-4072.patch,
> ippeiukai-ICUNormalizer2CharFilter-4752cad.zip
>
>
> I'd like to contribute a CharFilter that Unicode-normalizes input with ICU4J.
> The benefit of having this process as CharFilter is that tokenizer can work
> on normalised text while offset-correction ensuring fast vector highlighter
> and other offset-dependent features do not break.
> The implementation is available at following repository:
> https://github.com/ippeiukai/ICUNormalizer2CharFilter
> Unfortunately this is my unpaid side-project and cannot spend much time to
> merge my work to Lucene to make appropriate patch. I'd appreciate it if
> anyone could give it a go. I'm happy to relicense it to whatever that meets
> your needs.
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