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https://issues.apache.org/jira/browse/LUCENE-9939?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jacob Lauritzen updated LUCENE-9939:
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Status: Patch Available (was: Open)
> Proper ASCII folding of Danish/Norwegian characters Ø, Å
> --------------------------------------------------------
>
> Key: LUCENE-9939
> URL: https://issues.apache.org/jira/browse/LUCENE-9939
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/analysis
> Reporter: Jacob Lauritzen
> Priority: Minor
> Labels: easyfix
>
> The current version of the ASCIIFoldingFilter sets Å, å to A, a and Ø, ø to
> O, o which I believe is incorrect.
> Å was added by Norway as a replacement for the Aa (which is mapped to aa in
> the AsciiFoldingFilter) in 1917 and by Denmark in 1948. Aa is still used in a
> lot of names (as an example the second largest city in Denmark was originally
> named Aarhus, renamed to Århus in 1948 and named back to AArhus in 2010 for
> internationalization purposes).
> The story of Ø is similar. It's equivalent to Œ (which is mapped to oe), not
> ö (which is mapped to o) and is generally mapped to oe in ascii text.
> The third Danish character Æ is already properly mapped to AE.
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