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https://issues.apache.org/jira/browse/LUCENE-4261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423590#comment-13423590
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Robert Muir commented on LUCENE-4261:
-------------------------------------
The FunctionQuery's scorer has no subscorers, as far as the Scorer api
goes, its a 'leaf node'. Its score is the result of a function and thats it.
This is really the whole point of function queries.
You are then in 'function territory' (and whatever that function does is opaque
really).
> 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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