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https://issues.apache.org/jira/browse/LUCENE-2070?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir updated LUCENE-2070:
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Attachment: LUCENE-2070.patch
> document LengthFilter wrt Unicode 4.0
> -------------------------------------
>
> Key: LUCENE-2070
> URL: https://issues.apache.org/jira/browse/LUCENE-2070
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Analysis
> Reporter: Robert Muir
> Priority: Trivial
> Fix For: 3.1
>
> Attachments: LUCENE-2070.patch
>
>
> LengthFilter calculates its min/max length from TermAttribute.termLength()
> This is not characters, but instead UTF-16 code units.
> In my opinion this should not be changed, merely documented.
> If we changed it, it would have an adverse performance impact because we
> would have to actually calculate Character.codePointCount() on the text.
> If you feel strongly otherwise, fixing it to count codepoints would be a
> trivial patch, but I'd rather not hurt performance.
> I admit I don't fully understand all the use cases for this filter.
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