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From "Robert Muir (JIRA)" <>
Subject [jira] Commented: (LUCENE-1689) supplementary character handling
Date Sat, 13 Jun 2009 14:55:07 GMT


Robert Muir commented on LUCENE-1689:

Simon, I want to address your comment on performance.
I think that surrogate detection is cheap when done right and I don't think there's a ton
of places that need changes.
But I don't think any indicator is really appropriate, for example my TokenFilter might want
to convert one chinese character in the BMP to another one outside of the BMP. It is all unicode.

But there is more than just analysis involved here, for example I have not tested WildcardQuery:
? operator.
I'm not trying to go berzerko and be 'ultra-correct', but basic things like that should work.
For situations where its not worth it, i.e. FuzzyQuery's scoring, we should just doc that
the calculation is based on 'code units', and leave it alone.

> supplementary character handling
> --------------------------------
>                 Key: LUCENE-1689
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Robert Muir
>            Priority: Minor
>             Fix For: 2.9
>         Attachments: 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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