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From "Sean O'Connor (JIRA)" <>
Subject [jira] Commented: (LUCENE-794) SpanScorer and SimpleSpanFragmenter for Contrib Highlighter
Date Tue, 10 Apr 2007 17:56:32 GMT


Sean O'Connor commented on LUCENE-794:

I was able to apply the spanhighlighter5.patch. I'm inexperienced with ant and svn, so I assume
the slight troubles I had were self-inflicted; I mention them in case they are of any help.

I might have missed something, but my seemed to be missing the implementation
of the abstract isPayloadAvailable() method from TermPositions. That was causing my build
to fail, so I added the method, simply returning false.

After that change, the tests run, and life was good again. I do get a failed test at,
but it looks like that might be expected. The search is "[kannedy TO kznnedy]".

I am now looking into getting the total number of hits for a given query (for un-normalized
scoring), and the hit positions (saved for larger scale analysis and browsing). I have code
that does this, but hope I can improve on my existing approach by using this highlighting


> SpanScorer and SimpleSpanFragmenter for Contrib Highlighter
> -----------------------------------------------------------
>                 Key: LUCENE-794
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Other
>            Reporter: Mark Miller
>            Priority: Minor
>         Attachments:,,,,,,,,,,,,,,,,,,,,, spanhighlighter.patch,
spanhighlighter2.patch, spanhighlighter3.patch, spanhighlighter5.patch,,,,,,
> 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 for some background.
> There is a dependency on MemoryIndex.

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