Yes, you're right. Getting the scores of a second query based on the scores of the first query is probably not trivial, but probably possible with Lucene. And that combined with a QueryFilter would do the trick I suspect. Somehow the scores of the first query could be remembered and used as a boost (or other type of factor) the scores of the second query.
Why not just AND together the first and second query? That way they're both incorporated in the ranking. Filters are good when you don't want it to affect the ranking, and also when the first query is a criterion that you'll reuse for many queries (e.g., language=french), since the bit vectors can be cached (as by QueryFilter).
Doug
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