BooleanQuery explain with boost==0
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Key: LUCENE-451
URL: http://issues.apache.org/jira/browse/LUCENE-451
Project: Lucene - Java
Type: Bug
Components: Search
Versions: CVS Nightly - Specify date in submission
Reporter: Yonik Seeley
Priority: Minor
BooleanWeight.explain() uses the returned score of subweights to determine if a
clause matched.
If any required clause has boost==0, the returned score will be zero and the
explain for the entire BooleanWeight will be simply Explanation(0.0f, "match
required").
I'm not sure what the correct fix is here. I don't think it can be done based
on score alone, since that isn't how scorers work. Perhaps we need a new
method "boolean Explain.matched()" that returns true on a match, regardless of
what the score may be?
Related to the problem above, even if no boosts are zero, it it sometimes nice
to know *why* a particular query failed to match. It would mean a longer
explanation, but maybe we should include non matching explains too?
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