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From "Doron Cohen (JIRA)" <>
Subject [jira] Created: (LUCENE-1302) explain should not mask negative scores
Date Tue, 10 Jun 2008 13:10:45 GMT
explain should not mask negative scores

                 Key: LUCENE-1302
             Project: Lucene - Java
          Issue Type: Bug
          Components: Query/Scoring
            Reporter: Doron Cohen
            Assignee: Doron Cohen
            Priority: Minor
             Fix For: 2.4

Explanation.isMatch() returns false for 0 or negative scores. 
Hence negative scores are omitted from the explanation.
This causes, when using e.g. BoostingTermQuery with negative boosts, a difference between
the collected doc score and the score shown by explain().  

A word on the usage of this - BTQ with negative boosts is useful for "punishing" documents
for containing a term. It also allows all sorts of tricks with multiplying query boost by
the BTQ boost, so you get a positive score if both boosts have the same sign but negative
otherwise. - I am sure there other uses as well.

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