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Posted to dev@lucene.apache.org by "Robert Muir (JIRA)" <ji...@apache.org> on 2015/08/14 02:36:45 UTC

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

Robert Muir created LUCENE-6737:
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             Summary: 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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