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https://issues.apache.org/jira/browse/SOLR-9494?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley resolved SOLR-9494.
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Resolution: Fixed
Fix Version/s: 6.2.1
> CollapseQParserPlugin doesn't propagate needsScores() correctly
> ---------------------------------------------------------------
>
> Key: SOLR-9494
> URL: https://issues.apache.org/jira/browse/SOLR-9494
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: David Smiley
> Assignee: David Smiley
> Fix For: 6.2.1
>
> Attachments:
> SOLR_9494__CollapseQParser_s_collectors_should_override_needsScores__.patch
>
>
> CollapseQParserPlugin internally has a number of Lucene Collector
> implementations, all of which extend Solr DelegatingCollector which provides
> a default implementation of the method needsScores() based on what it's
> delegating too. But Collapsing's collectors fail to consider that these
> collectors _themselves_ sometimes need the score, irrespective of wether or
> not a delegate might.
> In most cases nobody would notice this bug because most queries don't seem to
> care. However, SpanQueries are cranky about this, which will either throw an
> AssertionError or NPE if you ask for a score without saying in advance you
> wanted them.
> I have a patch forthcoming, but am having trouble ATM reproducing to create a
> test. The most straight-forward test doesn't trip it. I have a failing test
> in a client environment, and a patch that fixes it. Reproducing seems to
> involve a cached query somehow.
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