[LUCENE-451] BooleanQuery explain with boost==0

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Component/s: core/search
• Assignee: Chris M. Hostetter
• Reporter: Yonik Seeley
• Created: 12/Oct/05 00:56
• Updated: 28/Aug/22 11:23
• Resolved: 27/Jun/06 01:40

Description

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?

Issue Links

• depends upon: LUCENE-605 Make Explanation include information about match/non-match