LargeDocHighlighter - another span highlighter optimized for large documents
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                 Key: LUCENE-1286
                 URL: https://issues.apache.org/jira/browse/LUCENE-1286
             Project: Lucene - Java
          Issue Type: Improvement
          Components: contrib/highlighter
    Affects Versions: 2.4
            Reporter: Mark Miller


The existing Highlighter API is rich and well designed, but the approach taken 
is not very efficient for large documents.

I believe that this is because the current Highlighter rebuilds the document by 
running through and scoring every every token in the tokenstream.

With a break in the current API, an alternate approach can be taken: rebuild 
the document by running through the query terms by using their offsets. The 
benefit is clear - a large doc will have a large tokenstream, but a query will 
likely be very small in comparison.

I expect this approach to be quite a bit faster for very large documents, while 
still supporting Phrase and Span queries.

First rough patch to follow shortly.

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