[jira] Updated: (LUCENE-2070) document LengthFilter wrt Unicode 4.0

["Robert Muir (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-2070?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Muir updated LUCENE-2070:
--------------------------------

    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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