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https://issues.apache.org/jira/browse/LUCENE-2019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12772135#action_12772135
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Robert Muir commented on LUCENE-2019:
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bq. I strongly disagree with the assumption that interchange and serialization
are synonymous.
Actually I won't argue with you too much about this. i only care about
lucene-java.
bq. I actually agree with this argument. What if Lucene needs more
process-internal characters? I don't have any way of gauging the probability
that it will in the future (other than the last eight years of history, during
which only one was deemed necessary). But what does Mike M. say? "Design for
now" or something like that?
right, the point is that in my processing as a user, i might need to have
delimiters or whatever.
i should not have to worry about lucene treating them as an *abstract
character* because the unicode standard says it should not.
so for example, if i create a MultiTermQuery, i should be able to use U+FFFE
and U+FFFF both internally, perhaps to delimit things for different reasons,
without any concern that they are stored in term text.
by storing them in term text, by definition they are being treated as abstract
character.
> 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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