[jira] [Created] (LUCENE-4825) PostingsHighlighter support for positional queries

["Luca Cavanna (JIRA)" <ji...@apache.org>]

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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