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https://issues.apache.org/jira/browse/LUCENE-1435?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steven Rowe updated LUCENE-1435:
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Attachment: LUCENE-1435.patch
Modifications in this patch:
# Added dependency on ICU4J 4.0
# Introduced ICUCollationKeyFilter, which uses ICU collation to produce the
collation keys
# Added Analyzer versions of the Filters, creating
IndexableBinaryStringTools-encoded collation keys from the single token
produced by KeywordTokenizer.
# Centralized testing to a base class, which the four test classes extend, to
avoid duplication
# Moved from contrib/analyzers/o/a/l/analysis/miscellaneous/ to a new contrib
package: contrib/collation, because it doesn't make sense to add a dependency
to the entire contrib/analyzers package just for ICUCollationKeyFilter/Analyzer
The external ICU4J dependency, which should be checked into
contrib/collation/lib/, can be downloaded here:
[http://download.icu-project.org/files/icu4j/4.0/icu4j-4_0.jar]. The license
for this jar is included in the patch at contrib/collation/lib/ICU-LICENSE.txt.
> 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, 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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