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https://issues.apache.org/jira/browse/LUCENE-6229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14312899#comment-14312899
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Michael McCandless commented on LUCENE-6229:
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LUCENE-2590 was the original motivation for this API, so that per-hit an app
could see which sub-clauses matched.
But it has not really been used much as far as I can tell, and it has just
caused hassle over time, so +1 to remove.
> 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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