[jira] [Commented] (LUCENE-6737) Add DecimalDigitFilter

["Uwe Schindler (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-6737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15032673#comment-15032673 ] 

Uwe Schindler commented on LUCENE-6737:
---------------------------------------

Just as idea: We could expand UnicodeData.java autogen'd to ICU extracted digits like UnicodeWhitespaceTokenizer? Just in case that the Java data may be strange (although I think it is a bug in the filter, as Hoss' said).

> Add DecimalDigitFilter
> ----------------------
>
>                 Key: LUCENE-6737
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6737
>             Project: Lucene - Core
>          Issue Type: New Feature
>            Reporter: Robert Muir
>             Fix For: Trunk, 5.4
>
>         Attachments: LUCENE-6737.patch
>
>
> TokenFilter that folds all unicode digits (http://unicode.org/cldr/utility/list-unicodeset.jsp?a=[:General_Category=Decimal_Number:]) to 0-9.
> Historically a lot of the impacted analyzers couldn't even tokenize numbers at all, but now they use standardtokenizer for numbers/alphanum tokens. But its usually the case you will find e.g. a mix of both ascii digits and "native" digits, and today that makes searching difficult.
> Note this only impacts *decimal* digits, hence the name DecimalDigitFilter. So no processing of chinese numerals or anything crazy like that.



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