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https://issues.apache.org/jira/browse/LUCENE-7996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16272506#comment-16272506
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Alan Woodward commented on LUCENE-7996:
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Rather than throwing errors from BoostingQuery and FunctionScoreQuery, could we
just set the score to 0? And document that functions that return negative
values will be truncated to 0 for scoring purposes.
> 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
> Attachments: LUCENE-7996.patch
>
>
> 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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