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https://issues.apache.org/jira/browse/LUCENE-2019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12772147#action_12772147
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Robert Muir edited comment on LUCENE-2019 at 10/30/09 10:53 PM:
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bq. And if I'm indexing to a RAM directory? The point is, the private-use char
is never seen external to the process (which includes both Lucene and it's
index).
whoah, lets not confuse private-use characters with non-characters. there is a
huge difference!!!!
<edit addition>
I see private-use characters as available to the end user, i.e. someone like DM
Smith trying to index Myanmar encoded in private-use chars (he mentioned this
before).
These are available for his use.
control characters are available for your use to concatenate or do strange
things.
process-internal (non-characters) should not be stored and are available for
processing, without concern that they will be treated as an abstract character.
was (Author: rcmuir):
bq. And if I'm indexing to a RAM directory? The point is, the private-use
char is never seen external to the process (which includes both Lucene and it's
index).
whoah, lets not confuse private-use characters with non-characters. there is a
huge difference!!!!
> 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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