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https://issues.apache.org/jira/browse/LUCENE-7580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15764653#comment-15764653
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Paul Elschot commented on LUCENE-7580:
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I have started with on using this in the tests for the surround query language,
I'll open an issue for that later.
This found a bug in ConjunctionNearSpansDocScorer.recordMatch().
A -1 slop can occur when the same term is used twice in a SpanNearQuery, and
this causes a division by zero in computing the slop factor in from
recordMatch().
This can be easily avoided by using 0 slop in such cases.
> Spans tree scoring
> ------------------
>
> Key: LUCENE-7580
> URL: https://issues.apache.org/jira/browse/LUCENE-7580
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Affects Versions: master (7.0)
> Reporter: Paul Elschot
> Priority: Minor
> Fix For: 6.x
>
> Attachments: LUCENE-7580.patch, LUCENE-7580.patch
>
>
> Recurse the spans tree to compose a score based on the type of subqueries and
> what matched
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