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https://issues.apache.org/jira/browse/LUCENE-2124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12787662#action_12787662
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Robert Muir commented on LUCENE-2124:
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bq. The alternatives don't scale well, true, but they don't result in
non-human-readable index terms, either, so for people that need human-readable
index terms and who have a low-cardinality term set, maybe we should leave the
alternatives in place?
yeah this is why i thought we can discuss the non-scalable alternatives
separately. maybe we leave them alone, but for now i just want to make progress
in contrib on a unicode 5.2 support. we can raise the issue later, I agree the
non-scalable alternatives are more user-friendly too, because they work with
the core queryparser for TermRangeQuery, etc.
If we really want to deprecate these non-scalable alternatives in the future,
we could consider making further improvements towards collation being a "first
class citizen". Similar maybe to what happened with NumericRange. Just not sure
how this would work yet...
> move JDK collation to core, ICU collation to ICU contrib
> --------------------------------------------------------
>
> Key: LUCENE-2124
> URL: https://issues.apache.org/jira/browse/LUCENE-2124
> Project: Lucene - Java
> Issue Type: Task
> Components: contrib/*, Search
> Reporter: Robert Muir
> Assignee: Robert Muir
> Priority: Minor
> Fix For: 3.1
>
> Attachments: LUCENE-2124.patch, LUCENE-2124.patch
>
>
> As mentioned on the list, I propose we move the JDK-based
> CollationKeyFilter/CollationKeyAnalyzer, currently located in
> contrib/collation into core for collation support (language-sensitive sorting)
> These are not much code (the heavy duty stuff is already in core,
> IndexableBinaryString).
> And I would also like to move the
> ICUCollationKeyFilter/ICUCollationKeyAnalyzer (along with the jar file they
> depend on) also currently located in contrib/collation into a contrib/icu.
> This way, we can start looking at integrating other functionality from ICU
> into a fully-fleshed out icu contrib.
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