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From "Steven Rowe (JIRA)" <>
Subject [jira] Created: (LUCENE-2749) Lexically sorted shingle filter
Date Mon, 08 Nov 2010 21:28:07 GMT
Lexically sorted shingle filter

                 Key: LUCENE-2749
             Project: Lucene - Java
          Issue Type: New Feature
          Components: Analysis
    Affects Versions: 3.1, 4.0
            Reporter: Steven Rowe
            Priority: Minor
             Fix For: 3.1, 4.0

Sometimes people want to know if words have co-occurred within a specific window onto the
token stream, but don't care what the order is.  A Lucene token filter (LexicallySortedWindowFilter?),
perhaps implemented as a ShingleFilter sub-class, could provide this functionality.

This feature would allow for exact term set equality queries (in the case of a full-field-width

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