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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