lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Ere Maijala (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-8129) Support for defining a Unicode set filter when using ICUFoldingFilter
Date Fri, 12 Jan 2018 14:12:00 GMT

     [ 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-unsubscribe@lucene.apache.org
For additional commands, e-mail: dev-help@lucene.apache.org


Mime
View raw message