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https://issues.apache.org/jira/browse/LUCENE-3426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13190550#comment-13190550
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Bill Bell commented on LUCENE-3426:
-----------------------------------
Is this automatic in SOLR? Or do we need to add a feature to support his in
SOLR?
> optimizer for n-gram PhraseQuery
> --------------------------------
>
> Key: LUCENE-3426
> URL: https://issues.apache.org/jira/browse/LUCENE-3426
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/search
> Affects Versions: 2.9.4, 3.0.3, 3.1, 3.2, 3.3, 3.4, 4.0
> Reporter: Koji Sekiguchi
> Assignee: Koji Sekiguchi
> Priority: Trivial
> Fix For: 3.5, 4.0
>
> Attachments: LUCENE-3426.patch, LUCENE-3426.patch, LUCENE-3426.patch,
> LUCENE-3426.patch, LUCENE-3426.patch, LUCENE-3426.patch, PerfTest.java,
> PerfTest.java
>
>
> If 2-gram is used and the length of query string is 4, for example q="ABCD",
> QueryParser generates (when autoGeneratePhraseQueries is true)
> PhraseQuery("AB BC CD") with slop 0. But it can be optimized PhraseQuery("AB
> CD") with appropriate positions.
> The idea came from the Japanese paper "N.M-gram: Implementation of Inverted
> Index Using N-gram with Hash Values" by Mikio Hirabayashi, et al. (The main
> theme of the paper is different from the idea that I'm using here, though)
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