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From "Mark Miller (JIRA)" <>
Subject [jira] Commented: (LUCENE-794) SpanScorer and SimpleSpanFragmenter for Contrib Highlighter
Date Mon, 12 Mar 2007 22:24:09 GMT


Mark Miller commented on LUCENE-794:

"Another approach may be to modify the MemoryIndex content to suit the query. Your code creates
a MemoryIndex when presented with the text of a field. If it recognised it was being used
in "field-insensitive mode" it could extract the query terms and create a MemoryIndex field
for each unique fieldname in the set of query terms"

This should work fine. I had dismissed it ( and again butted heads with it for a while now
that you mentioned it) because I couldn't see the forest through the trees. I kept thinking,
this is just not going to work with a Span query that has terms from different fields. Over
and over I thought that. How can I ignore fields in a SpanQuery. Now it hits me, rather embarrassingly,
such a SpanQuery doesn't make sense at all.

I will try your approach and submit a new patch.

- Mark

> 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,,,,,,
> 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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