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https://issues.apache.org/jira/browse/SOLR-814?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12640605#action_12640605
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Walter Underwood commented on SOLR-814:
---------------------------------------

This seems like a bad idea. Hirigana and katakana are used quite differently in 
Japanese. They are not interchangeable.

I was the engineer for Japanese support in Ultraseek for years and even visited 
our distributor there, but no one ever asked for this feature. They asked for a 
lot of things, but never this.

It is very useful, maybe essential, to normalize full-width and half-width 
versions of hirigana, katakana, and ASCII.


> Add new Japanese Hiragana Filter and Factory
> --------------------------------------------
>
>                 Key: SOLR-814
>                 URL: https://issues.apache.org/jira/browse/SOLR-814
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>    Affects Versions: 1.3
>            Reporter: Todd Feak
>            Priority: Minor
>         Attachments: SOLR-814.patch
>
>
> Japanese Hiragana and Katakana character sets can be easily translated 
> between. This filter normalizes all Hiragana characters to their Katakana 
> counterpart, allowing for indexing and searching using either.

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