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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-2684) it's not possible to access sub-query's freq information if BooleanScorer is use
Date Thu, 09 May 2013 23:06:02 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2684?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uwe Schindler updated LUCENE-2684:
----------------------------------

    Fix Version/s:     (was: 4.3)
                   4.4
    
> it's not possible to access sub-query's freq information if BooleanScorer is use
> --------------------------------------------------------------------------------
>
>                 Key: LUCENE-2684
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2684
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/search
>            Reporter: Michael McCandless
>             Fix For: 4.4
>
>
> LUCENE-2590 added an advanced feature, allowing an app to gather all sub-scorers for
any Query.
> This is powerful because then, during collection, the app can get some details about
how each sub-query "participated" in the overall match for the given document.
> However, I think this is completely broken if the BooleanQuery uses BooleanScorer, because
that scorer is not doc-at-once.  Instead, it batch processes chunks of 2048 sequential docIDs
per scorer.  This is a big performance gain, but it means that the sub scorers will all be
positioned to the end of the 2048 doc chunk while the docs that matched within that chunk
are collected.
> I don't think we can easily fix this... likely the "fix" is to make it easy(ier) to force
BQ to use BooleanScorer2 (which is doc-at-once)?  It is actually possible to force this, today,
by having your collector return false from acceptDocsOutOfOrder...

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