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https://issues.apache.org/jira/browse/SOLR-9104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15281873#comment-15281873
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Joel Bernstein commented on SOLR-9104:
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Ok, I think you've hit on the exact problem:
bq Off the top of my head, i don't know if that means there is a bug in the the
code that calls DelegatingCollectors, or if the bug is in
CollapsingQParserPlugin for assuing doSetNextReader will aways be called? ...
IIRC CollapsingQParserPlugin plays fast an loose with the normal contracts,
defering a lot of stuff that's normally done in collect(..) until the finish
method ... maybe it's not doing what it needs to do to delegate properly to
other nstances of itself when a segment matches no docs?
> NPE in CollapsingQParser when two fq={!collapse} and zero results
> -----------------------------------------------------------------
>
> Key: SOLR-9104
> URL: https://issues.apache.org/jira/browse/SOLR-9104
> Project: Solr
> Issue Type: Bug
> Affects Versions: 6.0
> Reporter: Markus Jelsma
> Fix For: 6.1, master (7.0)
>
>
> This is a very weird problem that is reproducible on a small production
> server, but not on the local machine although they run the same 6.0 version.,
> and have an almost identical index. The only minor difference is that
> production is a SolrCloud with 1 shard and two replica's, just for a bit of
> redundancy.
> The following query yields zero results and throws the NPE:
> {code}
> select?q=query:seis&fq={!collapse field=query_digest}&fq={!collapse
> field=result_digest}
> {code}
> The next query does yield results and does not throw anything, it just works
> as it should work:
> {code}
> select?q=query:seiz&fq={!collapse field=query_digest}&fq={!collapse
> field=result_digest}
> {code}
> The /select handler used does not add any fancy param other than rows.
> Here's the NPE:
> {code}
> 2016-05-11 14:10:27.666 ERROR (qtp1209271652-3338) [c:suggestions s:shard1
> r:core_node1 x:suggestions_shard1_replica1] o.a.s.s.HttpSolrCall
> null:java.lang.NullPointerException
> at
> org.apache.solr.search.CollapsingQParserPlugin$IntScoreCollector.finish(CollapsingQParserPlugin.java:814)
> at
> org.apache.solr.search.CollapsingQParserPlugin$IntScoreCollector.finish(CollapsingQParserPlugin.java:851)
> at
> org.apache.solr.search.SolrIndexSearcher.buildAndRunCollectorChain(SolrIndexSearcher.java:272)
> at
> org.apache.solr.search.SolrIndexSearcher.getDocListNC(SolrIndexSearcher.java:1794)
> at
> org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:1611)
> at
> org.apache.solr.search.SolrIndexSearcher.search(SolrIndexSearcher.java:634)
> at
> org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:529)
> at
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:287)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:155)
> {code}
> Edit: for the sake of clarity. It really needs double fq={!collapse bla bla
> for the NPE to appear. If i remove either of the filters from the query, i
> get a nice zero resultset back. Both fields are defined as int.
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