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Posted to dev@lucene.apache.org by "Robert Muir (JIRA)" <ji...@apache.org> on 2018/01/16 20:51:00 UTC
[jira] [Resolved] (LUCENE-8129) Support for defining a Unicode set
filter when using ICUFoldingFilter
[ https://issues.apache.org/jira/browse/LUCENE-8129?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Robert Muir resolved LUCENE-8129.
---------------------------------
Resolution: Fixed
Fix Version/s: 7.3
trunk
Thanks [~emaijala]!
> Support for defining a Unicode set filter when using ICUFoldingFilter
> ---------------------------------------------------------------------
>
> Key: LUCENE-8129
> URL: https://issues.apache.org/jira/browse/LUCENE-8129
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/analysis
> Reporter: Ere Maijala
> Priority: Minor
> Labels: ICUFoldingFilterFactory, patch-available, patch-with-test
> Fix For: trunk, 7.3
>
> Attachments: LUCENE-8129.patch, LUCENE-8129.patch
>
>
> While ICUNormalizer2FilterFactory supports a filter attribute to define a Unicode set filter, ICUFoldingFilterFactory does not support it. A filter allows one to e.g. exclude a set of characters from being folded. E.g. for Finnish and Swedish the filter could be defined like this:
> <filter class="solr.ICUFoldingFilterFactory" filter="[^åäöÅÄÖ]"/>
> Note: An additional MappingCharFilterFactory or solr.LowerCaseFilterFactory would be needed for lowercasing the characters excluded from folding. This is similar to what ElasticSearch provides (see https://www.elastic.co/guide/en/elasticsearch/plugins/current/analysis-icu-folding.html).
> I'll add a patch that does this similar to ICUNormalizer2FilterFactory. Applies at least to master and branch_7x.
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