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Date: Thu, 21 Feb 2008 08:01:19 -0800 (PST)
From: "Paul Elschot (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-794) Extend contrib Highlighter to
 properly support PhraseQuery, SpanQuery,  ConstantScoreRangeQuery
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    [ https://issues.apache.org/jira/browse/LUCENE-794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12571088#action_12571088 ] 

Paul Elschot commented on LUCENE-794:
-------------------------------------

One way to solve the problem of many terms in a range or a prefix query is by indexing terms in a hierarchy of prefixes, for example for a date CCYYMMDD can be indexed as all of C, CC, CCY, CCYY, CCYYMM, CCYYMMD and CCYYMMDD on the same position.
Then for a range and prefix queries the query analyzer can construct an OR over as few terms as possible.
Query search and highlighting would work faster and still correct as they are based on the term positions.


> Extend contrib Highlighter to properly support PhraseQuery, SpanQuery,  ConstantScoreRangeQuery
> -----------------------------------------------------------------------------------------------
>
>                 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-01-26-2008.patch, SpanHighlighter-01-28-2008.patch, spanhighlighter.patch, spanhighlighter10.patch, spanhighlighter11.patch, spanhighlighter12.patch, spanhighlighter2.patch, spanhighlighter3.patch, spanhighlighter5.patch, spanhighlighter6.patch, spanhighlighter7.patch, spanhighlighter8.patch, spanhighlighter9.patch, spanhighlighter_24_January_2008.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, PhraseQuery, and  ConstantScoreRangeQuery. New Query types are easy to add. 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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