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https://issues.apache.org/jira/browse/LUCENE-3426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13102406#comment-13102406
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Robert Muir commented on LUCENE-3426:
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Well if we apply the refactoring part of SOLR-2660 (we can split out into a
separate issue), we could add such a thing as an attribute to the fieldType?
I like the way your patch looks now! A couple more questions:
* doesn't the optimization also apply to MultiPhraseQuery? If so,
NGramPhraseQuery could extend MultiPhraseQuery and just rewrite to the correct
one (MultiPhrase or Phrase depending upon the situation after optimization)
* what about hashCode/equals? Although the same results will be returned,
scoring will differ, maybe it NGramPhraseQuery should implement these?
> 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
> Reporter: Koji Sekiguchi
> Priority: Trivial
> Attachments: 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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