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https://issues.apache.org/jira/browse/LUCENE-2124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12787654#action_12787654
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Steven Rowe commented on LUCENE-2124:
-------------------------------------

bq. this will move the contrib/collation JDK-based components to core

+1

bq. and later we should consider deprecating the alternatives that are not 
scalable.

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?

bq. this will move the contrib/collation ICU based components to contrib/iCU, 
and this is where I want to bring the unicode 5.2 support.

+1

> 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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