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From "Ere Maijala (JIRA)" <>
Subject [jira] [Updated] (LUCENE-8129) Support for defining a Unicode set filter when using ICUFoldingFilter
Date Fri, 12 Jan 2018 14:12:00 GMT


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:
>             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
> I'll add a patch that does this similar to ICUNormalizer2FilterFactory. Applies at least
to master and branch_7x.

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