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https://issues.apache.org/jira/browse/LUCENE-2069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12782637#action_12782637
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Simon Willnauer commented on LUCENE-2069:
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bq. damn we have to use the limit form of codePointAt, just to be sure.
no we don't - at least not in this particular case
bq. if term text truly ends with unpaired lead surrogate, codePointAt could
pair it with leftover trash trail surrogate from a previous token...
if this rare situation occurs the term length will still prevent the changed
trail surrogate from being part of the token. This includes a super tiny
overhead but I guess we can simply ignore this.
> fix LowerCaseFilter for unicode 4.0
> -----------------------------------
>
> Key: LUCENE-2069
> URL: https://issues.apache.org/jira/browse/LUCENE-2069
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Analysis
> Reporter: Robert Muir
> Assignee: Robert Muir
> Priority: Minor
> Fix For: 3.1
>
> Attachments: LUCENE-2069.patch, LUCENE-2069.patch, LUCENE-2069.patch,
> LUCENE-2069.patch, LUCENE-2069.patch
>
>
> lowercase suppl. characters correctly.
> this only fixes the filter, the LowerCaseTokenizer is part of a more complex
> issue (CharTokenizer)
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