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https://issues.apache.org/jira/browse/LUCENE-8658?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand resolved LUCENE-8658.
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Resolution: Fixed
Fix Version/s: master (9.0)
8.0
> Illegal assertion in WANDScorer
> -------------------------------
>
> Key: LUCENE-8658
> URL: https://issues.apache.org/jira/browse/LUCENE-8658
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Adrien Grand
> Priority: Minor
> Fix For: 8.0, master (9.0)
>
> Attachments: LUCENE-8658.patch
>
>
> [~jim.ferenczi] told me about an assertion error that he ran into while
> playing with WANDScorer.
> WANDScorer tries to not have to deal with accuracy issues on floating-point
> numbers. In order to do this, it turns all scores into integers by
> multiplying them by a scaling factor, and then rounding minimum competitive
> scores down and rounding maximum scores up. This scaling factor is computed
> in the constructor in such a way that scores end up in the 0..65536 range.
> Sub scorers that have a maximum score of +Infty are ignored.
> The assertion is triggered in the rare case that a Scorer returns +Infty for
> its maximum score when computing the scaling factor but then returns finite
> values that are greater than the maximum scores of other clauses when asked
> for the maximum score over smaller ranges of doc ids.
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