[ http://issues.apache.org/jira/browse/LUCENE-451?page=all ]
Hoss Man updated LUCENE-451:
----------------------------
Attachment: bq.containing.clause.with.zero.boost.tests.patch
slight bug in test2 - the old method of checking the results using Hits had a
differnet set of matching docs because of negatively scoring matches. This
version makes sense when using a HitCollector.
> 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,
> bq.containing.clause.with.zero.boost.tests.patch,
> 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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