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https://issues.apache.org/jira/browse/LUCENE-4261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423599#comment-13423599
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Robert Muir commented on LUCENE-4261:
-------------------------------------
The documentation for function query already states:
{noformat}
Returns a score for each document based on a ValueSource
{noformat}
So it only has one scorer, It doesnt operate on subscorers!
If you want to be able to navigate valuesources, thats
something else entirely that you would need to do with the
function query apis.
But it doesn't belong in the scorer api.
> 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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