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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-451) BooleanQuery explain with boost==0
Date Tue, 20 Jun 2006 01:49:30 GMT
     [ http://issues.apache.org/jira/browse/LUCENE-451?page=all ]

Hoss Man updated LUCENE-451:
----------------------------

    Attachment: bq.containing.clause.with.zero.boost.tests.patch

some test cases demonstrating discrepencies when a BooleanQuery has clauses of various types
with boosts of 0.0.  Some of these test cases may not be things we really want to commit (since
the score is "NaN") but they still serve as a good example for the problem.

(much of this patch is modified from some other tests I had orriginally attached to LUCENE-557
but did not commit)

> 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
>     Assignee: Hoss Man
>     Priority: Minor
>  Attachments: bq.containing.clause.with.zero.boost.tests.patch
>
> 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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