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https://issues.apache.org/jira/browse/LUCENE-2019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir updated LUCENE-2019:
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Attachment: LUCENE-2019.patch
here is a prototype patch.
because U+DFFE and U+DFFF are process-internal for all planes, the surrogate
case is easy (just treat these process-internal points in the unpaired
surrogates codepath)
for the additional bmp chars, they happen to be > UNI_SUR_HIGH_START, so again
it shouldnt be in the main branch.
Mike, if you have a moment maybe check this out, if its ok ill fix formatting
and add tests.
> 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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