[
https://issues.apache.org/jira/browse/LUCENE-8129?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ere Maijala updated LUCENE-8129:
--------------------------------
Attachment: LUCENE-8129.patch
Thanks, it was indeed bad.
I checked that Normalizer2.getInstance calls Norm2AllModes.getInstance which
returns a cached instance if available, so I believe you're right about it
being immutable. An improved patch is attached.
> 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
> Attachments: 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.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org
For additional commands, e-mail: dev-h...@lucene.apache.org
