[jira] [Created] (LUCENE-6747) FingerprintFilter - a TokenFilter for clustering/linking purposes

["Mark Harwood (JIRA)" <ji...@apache.org>]

Mark Harwood created LUCENE-6747:
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             Summary: FingerprintFilter - a TokenFilter for clustering/linking purposes
                 Key: LUCENE-6747
                 URL: https://issues.apache.org/jira/browse/LUCENE-6747
             Project: Lucene - Core
          Issue Type: New Feature
          Components: modules/analysis
            Reporter: Mark Harwood
            Priority: Minor


A TokenFilter that emits a single token which is a sorted, de-duplicated set of the input tokens.
This approach to normalizing text is used in tools like OpenRefine[1] and elsewhere [2] to help in clustering or linking texts.
The implementation proposed here has a an upper limit on the size of the combined token which is output.

[1] https://github.com/OpenRefine/OpenRefine/wiki/Clustering-In-Depth
[2] https://rajmak.wordpress.com/2013/04/27/clustering-text-map-reduce-in-python/



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