I am thinking of modifying lucene's current ranking algorithm to include the
document's recency-weightage. So that the latest modified documents gets
preference over earlier modified documents, which makes sense for news search.
(I believe) To do this I have to tinker with TermScorer.score() method, and
calculate document-score in its while (doc < end) {..} loop. The requirement
is that document's lastModifiedTime is stored in the doc's field, and
extracting this value could be quite expensive for every iteration in its
posting stream. One approach could be to store it in a separate file (like
Normalization) to avoid field-lookup.
Any other ideas/suggestions.. Or if anyone has already implemented this ?
thanks,
Prasen
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