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https://issues.apache.org/jira/browse/LUCENE-2019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12772184#action_12772184
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Steven Rowe commented on LUCENE-2019:
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bq. by disallowing all noncharacters as term text, lucene is *more free* to use
them as delimiters, and sentinel values, and such, as specified in chapter 3 of
the standard.
Lucene is more free, but Lucene's users are not. Quite the contrary.
IMHO, Lucene's users (applications that incorporate the Lucene library) should
be able to use Unicode data in ways that the standard allows ("Applications are
free to use any of these noncharacter code points internally").
U+FFFF was chosen for Lucene-internal use for reasons very similar to those
you're bringing up, Robert: something like "who would ever want to use
non-characters in an index?" However, this choice does not obligate Lucene to
take the same action for all other non-characters.
I think the fix here is documentation, not proscription.
> map unicode process-internal codepoints to replacement character
> ----------------------------------------------------------------
>
> Key: LUCENE-2019
> URL: https://issues.apache.org/jira/browse/LUCENE-2019
> 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 process-internally.
> 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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