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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-451) BooleanQuery explain with boost==0
Date Tue, 11 Oct 2005 15:58:05 GMT
BooleanQuery explain with boost==0
----------------------------------

         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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