Luca Cavanna created LUCENE-4825:
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Summary: PostingsHighlighter support for positional queries
Key: LUCENE-4825
URL: https://issues.apache.org/jira/browse/LUCENE-4825
Project: Lucene - Core
Issue Type: Improvement
Components: modules/highlighter
Affects Versions: 4.2
Reporter: Luca Cavanna
I've been playing around with the brand new PostingsHighlighter. I'm really
happy with the result in terms of quality of the snippets and performance.
On the other hand, I noticed it doesn't support positional queries. If you make
a span query, for example, all the single terms will be highlighted, even
though they haven't contributed to the match. That reminds me of the difference
between the QueryTermScorer and the QueryScorer (using the standard
Highlighter).
I've been trying to adapt what the QueryScorer does, especially the extraction
of the query terms together with their positions (what
WeightedSpanTermExtractor does). Next step would be to take that information
into account within the formatter and highlight only the terms that actually
contributed to the match. I'm not quite ready yet with a patch to contribute
this back, but I certainly intend to do so. That's why I opened the issue and
in the meantime I would like to hear what you guys think about it and discuss
how best we can fix it. I think it would be a big improvement for this new
highlighter, which is already great!
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