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https://issues.apache.org/jira/browse/LUCENE-6229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14324686#comment-14324686
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Terry Smith commented on LUCENE-6229:
-------------------------------------

[~rcmuir] Thanks for the backstory. I've been trying to wrap my head around 
where Lucene is going and this kind of information really helps.

It sounds like both [~rcmuir] and [~thetaphi] agree that Scorer.getChildren() 
is not an API that Lucene should support. Reading between the lines, this 
implies to me that scoring is moving to a bulk-only approach, which will bring 
great performance gains.

A best effort implementation of Scorer.getChildren() would be something that 
I'd be uncomfortable adding features on top of, although it could be useful for 
debugging. Unfortunately this is a showstopper for me as I rely on 
Scorer.getChildren() for some critical features, and need to do some serious 
thinking to figure out if I can formulate an alternative approach.


> Remove Scorer.getChildren?
> --------------------------
>
>                 Key: LUCENE-6229
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6229
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Priority: Minor
>
> This API is used in a single place in our code base: 
> ToParentBlockJoinCollector. In addition, the usage is a bit buggy given that 
> using this API from a collector only works if setScorer is called with an 
> actual Scorer (and not eg. FakeScorer or BooleanScorer like you would get in 
> disjunctions) so it needs a custom IndexSearcher that does not use the 
> BulkScorer API.



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