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https://issues.apache.org/jira/browse/LUCENE-2068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12779834#action_12779834
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Simon Willnauer commented on LUCENE-2068:
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bq: edit: sorry simon, mime-type/charset issues on my side, x-diff versus
x-patch thing
:) happens :)
bq. If it's really that broken for supplemental chars, we don't have to support
back compat, right?
+1 This code is completely broken without the patch, I would agree we do not
need it in this case.
simon
> fix reverseStringFilter for unicode 4.0
> ---------------------------------------
>
> Key: LUCENE-2068
> URL: https://issues.apache.org/jira/browse/LUCENE-2068
> Project: Lucene - Java
> Issue Type: Bug
> Components: contrib/analyzers
> Reporter: Robert Muir
> Assignee: Simon Willnauer
> Priority: Minor
> Fix For: 3.1
>
> Attachments: LUCENE-2068.patch, LUCENE-2068.patch, LUCENE_2068.patch,
> LUCENE_2068.patch
>
>
> ReverseStringFilter is not aware of supplementary characters: when it
> reverses it will create unpaired surrogates, which will be replaced by U+FFFD
> by the indexer (but not at query time).
> The wrong words will conflate to each other, and the right words won't match,
> basically the whole thing falls apart.
> This patch implements in-place reverse with the algorithm from apache harmony
> AbstractStringBuilder.reverse0()
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