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https://issues.apache.org/jira/browse/LUCENE-4903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13624419#comment-13624419
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Adrien Grand commented on LUCENE-4903:
--------------------------------------
The problem is that scorers are hard to track: scoring usually happens by
calling Scorer.score(Collector), which itself calls
Collector.setScorer(Scorer). Since the asserting scorer delegates to the
wrapped one, the asserting scorer gets lost, this is why Collector.setScorer
tries to get it back by using a weak hash map.
I'm not totally happy with it either and would really like to make
Scorer.score(Collector) use methods from the asserting scorer directly. We
can't rely on Scorer.score(Collector)'s default implementation since it relies
on Scorer.nextDoc and some scorers such as BooleanScorer don't implement this
method.
> Add AssertingScorer
> -------------------
>
> Key: LUCENE-4903
> URL: https://issues.apache.org/jira/browse/LUCENE-4903
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-4903.patch
>
>
> I think we would benefit from having an AssertingScorer that would assert
> that scorers are advanced correctly, return valid scores (eg. not NaN), ...
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