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https://issues.apache.org/jira/browse/LUCENE-943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir resolved LUCENE-943.
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Resolution: Fixed
This one is available as CollationKeyAnalyzer/ICUCollationKeyAnalyzer
> ComparatorKey in Locale based sorting
> -------------------------------------
>
> Key: LUCENE-943
> URL: https://issues.apache.org/jira/browse/LUCENE-943
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Search
> Reporter: Ronnie Kolehmainen
> Priority: Minor
> Attachments: LocaleBasedSortComparator.diff
>
>
> This is a reply/follow-up on Chris Hostetter's message on Lucene developers
> list (aug 2006):
> http://mail-archives.apache.org/mod_mbox/lucene-java-dev/200608.mbox/%3cpine.lnx.4.58.0608211050330.5...@hal.rescomp.berkeley.edu%3e
> > perhaps it would be worthwhile for comparatorStringLocale to convert the
> > String[] it gets back from FieldCache.DEFAULT.getStrings to a new
> > CollationKey[]? or maybe even for FieldCache.DEFAULT.getStrings to be
> > deprecated, and replaced with a
> > FieldCache.DEFAULT.getCollationKeys(reader,field,Collator)?
> I think the best is to keep the default behavior as it is today. There is a
> cost of building caches for sort fields which I think not everyone wants.
> However for some international production environments there are indeed
> possible performance gains in comparing precalculated keys instead of
> comparing strings with rulebased collators.
> Since Lucene's Sort architecture is pluggable it is easy to create a custom
> locale-based comparator, which utilizes the built-in caching/warming
> mechanism of FieldCache, and may be used in SortField constructor.
> I'm not sure whether there should be classes for this in Lucene core or not,
> but it could be nice to have the option of performance vs. memory consumption
> in localized sorting without having to use additional jars.
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