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https://issues.apache.org/jira/browse/LUCENE-991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12525709
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Peter Keegan commented on LUCENE-991:
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Hi Grant,
> TopDocs hits = searcher.search(query, null, 100);
> assertTrue("hits Size: " + hits.totalHits + " is not: " + 0, hits.totalHits
> == 0);
TopDocCollector discards hits with score = 0, so that's not a fair comparison.
If you do a similar test with TermQuery (with a field boost = 0) instead of
BoostingTermQuery, you'll see the difference. Even terms with 0 weight are
included in the explanation. Make sense?
Peter
> BoostingTermQuery.explain() bugs
> --------------------------------
>
> Key: LUCENE-991
> URL: https://issues.apache.org/jira/browse/LUCENE-991
> Project: Lucene - Java
> Issue Type: Bug
> Components: Search
> Affects Versions: 2.2
> Reporter: Peter Keegan
> Assignee: Grant Ingersoll
> Priority: Minor
> Attachments: TestBoostingTermQuery.patch,
> TestBoostingTermQuery2.patch, TestBoostingTermQuery3.patch
>
>
> There are a couple of minor bugs in BoostingTermQuery.explain().
> 1. The computation of average payload score produces NaN if no payloads were
> found. It should probably be:
> float avgPayloadScore = super.score() * (payloadsSeen > 0 ? (payloadScore /
> payloadsSeen) : 1);
> 2. If the average payload score is zero, the value of the explanation is 0:
> result.setValue(nonPayloadExpl.getValue() * avgPayloadScore);
> If the query is part of a BooleanClause, this results in:
> "no match on required clause..."
> "failure to meet condition(s) of required/prohibited clause(s)"
> The average payload score can be zero if the field boost = 0.
> I've attached a patch to 'TestBoostingTermQuery.java', however, the test
> 'testNoPayload' fails in 'SpanScorer.score()' because the doc = -1. It looks
> like 'setFreqCurrentDoc() should have been called before 'score()'. Maybe
> someone more knowledgable of spans could investigate this.
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