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https://issues.apache.org/jira/browse/LUCENE-794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12558803#action_12558803
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Grant Ingersoll commented on LUCENE-794:
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Never mind, I went back and read the thread at
http://lucene.markmail.org/message/p4gfxewk6jcqfxxj?q=highlighter+list:org%2Eapache%2Elucene%2Ejava-user
which I think accounts for this approach and makes sense to me.
> Extend contrib Highlighter to properly support phrase queries and span queries
> ------------------------------------------------------------------------------
>
> Key: LUCENE-794
> URL: https://issues.apache.org/jira/browse/LUCENE-794
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Other
> Reporter: Mark Miller
> Priority: Minor
> Attachments: spanhighlighter.patch, spanhighlighter10.patch,
> spanhighlighter11.patch, spanhighlighter12.patch, spanhighlighter2.patch,
> spanhighlighter3.patch, spanhighlighter5.patch, spanhighlighter6.patch,
> spanhighlighter7.patch, spanhighlighter8.patch, spanhighlighter9.patch,
> spanhighlighter_patch_4.zip
>
>
> This patch adds a new Scorer class (SpanQueryScorer) to the Highlighter
> package that scores just like QueryScorer, but scores a 0 for Terms that did
> not cause the Query hit. This gives 'actual' hit highlighting for the range
> of SpanQuerys and PhraseQuery. There is also a new Fragmenter that attempts
> to fragment without breaking up Spans.
> See http://issues.apache.org/jira/browse/LUCENE-403 for some background.
> There is a dependency on MemoryIndex.
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