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Date: Sun, 2 Nov 2008 10:34:44 -0800 (PST)
From: "Robert Muir (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-1435) CollationKeyFilter: convert tokens
 into CollationKeys encoded using IndexableBinaryStringTools
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    [ https://issues.apache.org/jira/browse/LUCENE-1435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12644604#action_12644604 ] 

Robert Muir commented on LUCENE-1435:
-------------------------------------

One alternative is that the ICU implementation has versioning specifically for this purpose.

The version information of Collator is a 32-bit integer. If a new version of ICU has changes affecting the content of collation elements, the version information will be changed. In that case, to use the new version of ICU collator will require regenerating any saved or stored sort keys. However, since ICU 1.8.1. it is possible to build your program so that it uses more than one version of ICU. Therefore, you could use the current version for the features you need and use the older version for collation.

> 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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