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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