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From "Hiroaki Kawai (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-1229) NGramTokenFilter optimization in query phase
Date Fri, 14 Mar 2008 02:31:24 GMT
NGramTokenFilter optimization in query phase
--------------------------------------------

                 Key: LUCENE-1229
                 URL: https://issues.apache.org/jira/browse/LUCENE-1229
             Project: Lucene - Java
          Issue Type: Improvement
          Components: contrib/*
            Reporter: Hiroaki Kawai


I found that NGramTokenFilter-ed token stream could be optimized in query.

A standard 1,2 NGramTokenFilter will generate a token stream from "abcde" as follows:
a ab b bc c cd d de e

When we index "abcde", we'll use all of the tokens.

But when we query, we only need:
ab cd de

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