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https://issues.apache.org/jira/browse/LUCENE-2684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13453261#comment-13453261
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Robert Muir commented on LUCENE-2684:
-------------------------------------
Collectible... (not serious)
> 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: 4.1
>
>
> 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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