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From "Robert Muir (JIRA)" <>
Subject [jira] Commented: (LUCENE-2019) map unicode process-internal codepoints to replacement character
Date Thu, 29 Oct 2009 21:19:59 GMT


Robert Muir commented on LUCENE-2019:

I think this code won't be so intrusive or hairy.
Here is the list in surrogate pair representation.
Note that for the > BMP points, the trail surrogate is always U+DFFE or U+DFFF

BMP points:
\uFFFF <-- already handled

> BMP points:

> map unicode process-internal codepoints to replacement character
> ----------------------------------------------------------------
>                 Key: LUCENE-2019
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Robert Muir
>            Priority: Minor
> A spinoff from LUCENE-2016.
> There are several process-internal codepoints in unicode, we should not store these in
the index.
> Instead they should be mapped to replacement character (U+FFFD), so they can be used
> An example of this is how Lucene Java currently uses U+FFFF process-internally, it can't
be in the index or will cause problems. 

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