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From "Robert Muir (JIRA)" <>
Subject [jira] Created: (SOLR-1571) unicode collation support
Date Wed, 18 Nov 2009 06:00:42 GMT
unicode collation support

                 Key: SOLR-1571
             Project: Solr
          Issue Type: New Feature
          Components: Analysis
            Reporter: Robert Muir
            Priority: Minor
         Attachments: SOLR-1571.patch

This patch adds support for unicode collation (searching and sorting).
Unicode collation is helpful in a search engine, for many languages you want things to match
or sort differently.
You might even want to use copyfield and support different sort orders/matching schemes if
you need to support multiple languages.

This is simply a factory for lucene's CollationKeyFilter, which indexes binary collation keys
in a special format that preserves binary sort order.

I've added support for creating a Collator in two ways:
* system collator from a Locale spec (language + country + variant)
* tailored collator from custom rules in a text file

in no way is there an option to use the "default" locale of the jvm, (I consider this a bit
in this patch, it is mandatory to define the locale explicitly for a system collator.

The required lucene-collation-2.9.1.jar is only 12KB.

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