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From "paul.elschot (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-451) BooleanQuery explain with boost==0
Date Tue, 11 Oct 2005 18:14:04 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-451?page=comments#action_12331818 ] 

paul.elschot commented on LUCENE-451:
-------------------------------------

I fully agree, but IndexSearcher.java at line 107 does not conform,
it will only provide a hit when its score is positive.

Implementing Explanation.matched() could be more than a bit of work, because
many existing explain() methods will be need to be adapted.
Explanation.setMatched() would also be needed, although such a flag
could be set to true by default.

Regards,
Paul Elschot.


> 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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