Hello, I have been trying out Yonik's excellent FunctionQuery (from Solr), but am having some problems regarding the scoring of FunctionQueries in conjunction with other queries.
I am currently researching a data fusion approach, where you have several separate scores for a document and combine them to produce a composite score. One of these scores is the regular Lucene score, which I essentially treat as a black box. I'm trying a simple linear combination, ie. score = a * score_a + b * score_b ... I have one Query produced by a QueryParser, and one (possibly several) FunctionQueries which provide additional scores. I combine them with a BooleanQuery with required clauses. When I look at the explanation of such a combined Query, I see that the scores of the subqueries are all multiplied by the query norm -- but I want only the score of the full-text query to be multiplied by the query norm. The function queries should be added to the final query as they are (the factors a, b, ... could be set using a query boost.) How do I achieve that? I'm rather lost in the forest of Scorer, Similarity and Weight right now. Which is the right place to add such a modification, so that it doesn't mess up the rest of the scoring? I already tried extending BooleanQuery so that getSimilarity returns a Similarity which overloads just queryNorm, to return 1.0. But this queryNorm is then used both for the FunctionQuery and the full-text query. Thanks very much for your answers. Regards, Sebastian -- Sebastian Kirsch <[EMAIL PROTECTED]> [http://www.sebastian-kirsch.org/] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
