BoostingTermQuery.explain() bugs
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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
Priority: Minor
Attachments: TestBoostingTermQuery.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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