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From "Mark Miller (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-794) Extend contrib Highlighter to properly support phrase queries and span queries
Date Thu, 13 Sep 2007 15:53:33 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-794?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mark Miller updated LUCENE-794:
-------------------------------

    Attachment: spanhighlighter11.patch

Thanks a lot Andy. As I suspected, the issue is that the conversion from PhraseQuery to SpanQuery
is inexact. I have updated the code to handle this case though. If a PhraseQuery has 0 slop
then the created Span query will now force an inorder match. This should be a nice improvement
to the PhraseQuery to SpanQuery approximation.

Patch with fix and new junit test attached.

patch 11

- Mark

> 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: CachedTokenStream.java, CachedTokenStream.java, CachedTokenStream.java,
DefaultEncoder.java, Encoder.java, Formatter.java, Highlighter.java, Highlighter.java, Highlighter.java,
Highlighter.java, Highlighter.java, HighlighterTest.java, HighlighterTest.java, HighlighterTest.java,
HighlighterTest.java, MemoryIndex.java, QuerySpansExtractor.java, QuerySpansExtractor.java,
QuerySpansExtractor.java, QuerySpansExtractor.java, SimpleFormatter.java, spanhighlighter.patch,
spanhighlighter10.patch, spanhighlighter11.patch, spanhighlighter2.patch, spanhighlighter3.patch,
spanhighlighter5.patch, spanhighlighter6.patch, spanhighlighter7.patch, spanhighlighter8.patch,
spanhighlighter9.patch, spanhighlighter_patch_4.zip, SpanHighlighterTest.java, SpanHighlighterTest.java,
SpanScorer.java, SpanScorer.java, WeightedSpanTerm.java
>
>
> 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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