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From "Doron Cohen (JIRA)" <>
Subject [jira] Resolved: (LUCENE-1302) explain should not mask negative scores
Date Tue, 10 Jun 2008 19:51:45 GMT


Doron Cohen resolved LUCENE-1302.

       Resolution: Invalid
    Lucene Fields: [Patch Available]  (was: [Patch Available, New])

Okay I am convinced, thanks for bearing with me Hoss and Paul.

So I am closing this issue as "Invalid". 

Just to summarize: "A match is a match is a match" (quoting Hoss) seem the key concept:
I always thought of "match" as a saying (by the query) - "that document is relevant for this
Seems to me now that a more accurate interpretation is: "that document is *related* to this
where *positively related* would be *relevant* and *negatively related* would be the opposite.

> explain should not mask negative scores
> ---------------------------------------
>                 Key: LUCENE-1302
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Query/Scoring
>            Reporter: Doron Cohen
>            Assignee: Doron Cohen
>            Priority: Minor
>             Fix For: 2.4
>         Attachments: lucene-1302-explain-negative.patch
> 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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