[jira] [Created] (LUCENE-7996) Should we require positive scores?

["Adrien Grand (JIRA)" <ji...@apache.org>]

Adrien Grand created LUCENE-7996:
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             Summary: Should we require positive scores?
                 Key: LUCENE-7996
                 URL: https://issues.apache.org/jira/browse/LUCENE-7996
             Project: Lucene - Core
          Issue Type: Wish
            Reporter: Adrien Grand
            Priority: Minor


Having worked on MAXSCORE recently, things would be simpler if we required that scores are positive. Practically, this would mean 
 - forbidding/fixing similarities that may produce negative scores (we have some of them)
 - forbidding things like negative boosts
 - fixing the scoring formula of some queries like {{BoostingQuery}} (which subtracts a score to another score) so that the end result may never be negative

So I'd be curious to have opinions whether this would be a sane requirement or whether we need to be able to cope with negative scores eg. because some similarities that we want to support produce negative scores by design.



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