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https://issues.apache.org/jira/browse/LUCENE-3318?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mike Sokolov updated LUCENE-3318:
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Attachment: LUCENE-3318.patch
Updated patch now handles MultiTermQuerys nested (however deeply) in
BooleanQuerys, and does not modify the queries in order to rewrite them.
This approach can now be used for highlighting many types of queries
(SpanQueries are a special case - they do their own MTQ rewriting), but still
does require inspection of query types. It might be nice in the future to
provide a Query rewriting interface that allows the caller more control over
the kind of rewriting to be done. With this, it would be possible to expect
future query types to implement a rewriting method that could support
highlighting without the need for instanceof, etc.
I added a simple white-space boundary detection that can be used to adjust
snippet boundaries to fall between words. The basic idea could be extended to
do sentence boundary detection.
I added a Highlighter parameter (maxFragsToScore) that limits the number of
fragments considered when attempting to find the highest-scoring one(s). This
gives some decent speedup if you just want to find the first fragment in a
document.
> Sketch out highlighting based on term positions / position iterators
> --------------------------------------------------------------------
>
> Key: LUCENE-3318
> URL: https://issues.apache.org/jira/browse/LUCENE-3318
> Project: Lucene - Java
> Issue Type: Sub-task
> Components: modules/highlighter
> Affects Versions: Positions Branch
> Reporter: Simon Willnauer
> Assignee: Mike Sokolov
> Fix For: Positions Branch
>
> Attachments: LUCENE-3318.patch, LUCENE-3318.patch, LUCENE-3318.patch
>
>
> Spinn off from LUCENE-2878. Since we have positions on a large number of
> queries already in the branch is worth looking at highlighting as a real
> consumer of the API. A prototype is already committed.
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