StackOverflow2013

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2012-11-07T12:05:58.123
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Shashikant Kore is correct to say that scores for each field are summed. This, however, is only true before the contribution of the <code>queryNorm</code> and <code>coord</code> factors, meaning the final scores will not likely add up. Each score is multiplied by the <a href="http://lucene.apache.org/core/old_versioned_docs/versions/3_0_1/api/core/org/apache/lucene/search/Similarity.html#formula_queryNorm" rel="nofollow"><code>queryNorm</code></a> factor, which is calculated per query and hence differs for each of <code>(name:bill)</code>, <code>(gender:male)</code>, and <code>(name:bill OR gender:male)</code>. Nor is the <code>queryNorm</code> for the combined query merely the sum of the <code>queryNorm</code>s for the two single-term queries. So the scores only sum if you divide each score by the <code>queryNorm</code> factor for that query. The <a href="http://lucene.apache.org/core/old_versioned_docs/versions/3_0_1/api/core/org/apache/lucene/search/Similarity.html#formula_coord" rel="nofollow"><code>coord</code></a> factor may also pay a part: the default scorer multiplies the score by the proportion of query terms that were matched. So you can only rely on summation after accounting for <code>queryNorm</code> where all terms match (or <code>coord</code> is disabled). You can see exactly how a score is calculated using the <a href="http://lucene.apache.org/core/old_versioned_docs/versions/3_5_0/api/core/org/apache/lucene/search/IndexSearcher.html#explain%28org.apache.lucene.search.Query,%20int%29" rel="nofollow"><code>explain</code></a> functionality, available in Solr through the <code>debugQuery=true</code> parameter.
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1. POHow does Lucene compute multifield score?
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1. USjoeln
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