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From "Robert Muir (JIRA)" <>
Subject [jira] Commented: (LUCENE-2019) map unicode process-internal codepoints to replacement character
Date Fri, 30 Oct 2009 23:19:59 GMT


Robert Muir commented on LUCENE-2019:

Steven, yes you are arguing the interchange part.

I am arguing the treatment of a *noncharacter* as an *abstract character*.
If a lucene index stores a noncharacter as if it were any other character (i.e. within a Term),
then its treated as an abstract character.

if you disagree with this patch, then you should also disagree with treating U+FFFF special!

I don't see how in the world U+FFFF is different than any other codepoint in the noncharacter
category in this regard!

> 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
>         Attachments: LUCENE-2019.patch
> 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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