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From "Mark Miller (JIRA)" <>
Subject [jira] Commented: (LUCENE-1689) supplementary character handling
Date Mon, 16 Nov 2009 21:02:39 GMT


Mark Miller commented on LUCENE-1689:

bq. Mark honestly, I do not yet know how this one could be reasonably done.

Then thats what I am saying we should be documenting.

bq. how in the hell do we know which JVM version was used to create some given index????

If something like this made sense long term, we can start putting it in as index metadata
- not helpful now, but could end up being so.

> supplementary character handling
> --------------------------------
>                 Key: LUCENE-1689
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Robert Muir
>            Priority: Minor
>             Fix For: 3.1
>         Attachments: LUCENE-1689.patch, LUCENE-1689.patch, LUCENE-1689.patch, LUCENE-1689_lowercase_example.txt,
> for Java 5. Java 5 is based on unicode 4, which means variable-width encoding.
> supplementary character support should be fixed for code that works with char/char[]
> For example:
> StandardAnalyzer, SimpleAnalyzer, StopAnalyzer, etc should at least be changed so they
don't actually remove suppl characters, or modified to look for surrogates and behave correctly.
> LowercaseFilter should be modified to lowercase suppl. characters correctly.
> CharTokenizer should either be deprecated or changed so that isTokenChar() and normalize()
use int.
> in all of these cases code should remain optimized for the BMP case, and suppl characters
should be the exception, but still work.

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