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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 22:12:59 GMT


Robert Muir commented on LUCENE-2019:

Steven, the only reason I might disagree is that a Lucene Index is supposed to be portable
across different languages other than Lucene Java.

in my opinion, if you are to store process-internal codepoints as abstract characters in terms,
then you should not claim that Lucene indexes are in any Unicode format,
because then they violate the standard.

By *not* storing them in terms, then you are free to use them as delimiters, or other purposes.
right now U+FFFF is used as a delimiter, but who knows, maybe someday you might need more?

> 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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