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https://issues.apache.org/jira/browse/LUCENE-4261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423585#comment-13423585
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Steven Bethard commented on LUCENE-4261:
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It's true that QueryValueSources aren't Scorers, but the QueryDocValues of a
QueryValueSource *does* contain a Scorer. Conceptually, it feels like a
FunctionQuery with QueryValueSources inside of it should be returning the
Scorers from the queries as part of its getChildren(). But perhaps that's just
too difficult to implement...
> Scorers return empty getChildren
> --------------------------------
>
> Key: LUCENE-4261
> URL: https://issues.apache.org/jira/browse/LUCENE-4261
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/query/scoring
> Affects Versions: 4.0-ALPHA
> Reporter: Steven Bethard
>
> Scorer.getChildren() returns an empty list for some Scorers that conceptually
> do have children, including:
> * scorer for a BoostedQuery
> * scorer for a FunctionQuery with nested QueryValueSources
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