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https://issues.apache.org/jira/browse/LUCENE-1689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12778516#action_12778516
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Mark Miller commented on LUCENE-1689:
-------------------------------------
If there is nothing we can do here, then we just have to do the best we can -
such as a prominent notice alerting that if you transition JVM's between
building and searching the index and you are using or doing X, things will
break.
We should put this in a spot that is always pretty visible - perhaps even a new
readme file titlted something like IndexBackwardCompatibility or something, to
which we can add other tips and gotchyas as they come up. Or
MaintainingIndicesAcrossVersions, or
FancyWhateverGetsYourAttentionAboutUpgradingStuff. Or a permanent entry/sticky
entry at the top of Changes.
> supplementary character handling
> --------------------------------
>
> Key: LUCENE-1689
> URL: https://issues.apache.org/jira/browse/LUCENE-1689
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Robert Muir
> Priority: Minor
> Fix For: 3.1
>
> Attachments: LUCENE-1689.patch, LUCENE-1689.patch, LUCENE-1689.patch,
> LUCENE-1689_lowercase_example.txt, testCurrentBehavior.txt
>
>
> for Java 5. Java 5 is based on unicode 4, which means variable-width encoding.
> supplementary character support should be fixed for code that works with
> char/char[]
> For example:
> StandardAnalyzer, SimpleAnalyzer, StopAnalyzer, etc should at least be
> changed so they don't actually remove suppl characters, or modified to look
> for surrogates and behave correctly.
> LowercaseFilter should be modified to lowercase suppl. characters correctly.
> CharTokenizer should either be deprecated or changed so that isTokenChar()
> and normalize() use int.
> in all of these cases code should remain optimized for the BMP case, and
> suppl characters should be the exception, but still work.
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