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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-6042) CustomScoreQuery Explain differs from the actual score when topLevelBoost is used.
Date Fri, 05 Dec 2014 18:32:13 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-6042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14235856#comment-14235856
] 

Robert Muir commented on LUCENE-6042:
-------------------------------------

Thank you: i thought failures were maybe ghosts, but i had not suppressed everything affected.

> CustomScoreQuery Explain differs from the actual score when topLevelBoost is used.
> ----------------------------------------------------------------------------------
>
>                 Key: LUCENE-6042
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6042
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/query/scoring
>    Affects Versions: 4.8
>            Reporter: Denis Lantsman
>            Assignee: Robert Muir
>            Priority: Minor
>             Fix For: 4.10.3, 5.0, Trunk
>
>         Attachments: CustomScoreQuery.patch, LUCENE-6042.patch
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> CustomScoreQuery.java, doExplain has the following line:
> {code}
> res.addDetail(new Explanation(getBoost(), "queryBoost"));
> {code}
> This multiplies the custom score query by just the boost of the current query, and not
by
> {code}
> queryWeight=topLevelBoost*getBoost();
> {code}
> which is the value that's actually used during scoring. This leads to drastically different
scores in the debug info, relative to the actual score, when the query is a subquery of another
one, like a BooleanQuery clause, with a non-1 boost.



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