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https://issues.apache.org/jira/browse/LUCENE-1435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12644600#action_12644600
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Steven Rowe commented on LUCENE-1435:
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Three problems I can think of off the top of my head with attempting an
automatically managed solution to the problem of CollationKey comparability:
# There doesn't seem to be any way of ascertaining the RuleBasedCollator
version, so one would have to store exact JVM version and Locale used to
genenerate the Collator, and the strength used, and then fail any range or sort
operations if the indexed CollationKeys were produced with ones different from
the current ones.
# Lucene doesn't have an index-level per-field place to store arbitrary
information.
# Other implementations of java.text.Collator, besides RuleBasedCollator, are
certainly possible.
So, it seems to me, either the user of this functionality has to manage the
versioning external to the Lucene index, or they can't use the functionality :).
Would strong warnings in the javadocs be enough to allow people to take
appropriate precautions?
> CollationKeyFilter: convert tokens into CollationKeys encoded using
> IndexableBinaryStringTools
> ----------------------------------------------------------------------------------------------
>
> Key: LUCENE-1435
> URL: https://issues.apache.org/jira/browse/LUCENE-1435
> Project: Lucene - Java
> Issue Type: New Feature
> Affects Versions: 2.4
> Reporter: Steven Rowe
> Priority: Minor
> Fix For: 2.9
>
> Attachments: LUCENE-1435.patch
>
>
> Converts each token into its CollationKey using the provided collator, and
> then encodes the CollationKey with IndexableBinaryStringTools, to allow it to
> be stored as an index term.
> This will allow for efficient range searches and Sorts over fields that need
> collation for proper ordering.
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