Lexically sorted shingle filter
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Key: LUCENE-2749
URL: https://issues.apache.org/jira/browse/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 window).
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