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https://issues.apache.org/jira/browse/LUCENE-6229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14334937#comment-14334937
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Terry Smith commented on LUCENE-6229:
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[~rcmuir] Sorry for excluding that scenario, it wasn't intentional.
If you all decide to keep getChildren(), then I'd love to get the contract
described so people know what to expect.
I think these statements are correct:
# Scorer.getChildren() returns the immediate child scorers
# A returned scorer may be
## unpositioned (never had next() or advance() called on it)
## positioned on a valid document that is before, on, or after the current
document
## exhausted and thus positioned at NO_MORE_DOCS
# You MUST NOT call next() or advance() on the returned scorers yourself
And have these questions:
# Can I walk the returned scorers to get to all non-null leaf scorers?
# Can I position the returned scorers on the current document by calling
freq(), score() or something else?
> 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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