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https://issues.apache.org/jira/browse/LUCENE-7957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16153732#comment-16153732
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Michael McCandless commented on LUCENE-7957:
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Thanks [~jpountz]; I think I hope we don't remove this API.
I'm running BooleanQuery that (roughly) looks for text matches from three
possible places: 1) user-visible text fields (e.g. title), 2) a hidden keywords
field and 3) in another hidden field recording what past queries led to user
actions on this item.
I use a complex expression for scoring these hits, and one of the inputs to
that expression was "did this hit match only due to #2?" or "only due to #3?",
i.e. it wants to see which sub-clauses lead to this document being a hit, and
score differently.
I realize I could also run 3 separate queries, and save away arrays to remember
which clause contributed to which hits, but I suspect that's less efficient /
more RAM consuming.
> ConjunctionScorer.getChildren does not return all children
> ----------------------------------------------------------
>
> Key: LUCENE-7957
> URL: https://issues.apache.org/jira/browse/LUCENE-7957
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/search
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: master (8.0), 7.1
>
>
> Today it returns all scoring children and misses the `FILTER` clauses; I
> think we just need to save the incoming `required` parameter to the ctor and
> iterate over those in `getChildren` since `scorers` is a subset of `required`?
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