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https://issues.apache.org/jira/browse/SOLR-9104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15974805#comment-15974805
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Markus Jelsma commented on SOLR-9104:
-------------------------------------

NPE is still present, stack trace is slightly different today:

{code}
2017-04-19 14:41:18.657 ERROR (qtp331844619-249) [c:logs s:shard2 r:core_node4 
x:logs_shard2_replica2] o.a.s.s.HttpSolrCall null:java.lang.NullPointerException
        at 
org.apache.solr.search.CollapsingQParserPlugin$OrdScoreCollector.finish(CollapsingQParserPlugin.java:617)
        at 
org.apache.solr.search.CollapsingQParserPlugin$OrdScoreCollector.finish(CollapsingQParserPlugin.java:667)
        at 
org.apache.solr.search.SolrIndexSearcher.buildAndRunCollectorChain(SolrIndexSearcher.java:240)
        at 
org.apache.solr.search.SolrIndexSearcher.getDocListNC(SolrIndexSearcher.java:2027)
        at 
org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:1844)
        at 
org.apache.solr.search.SolrIndexSearcher.search(SolrIndexSearcher.java:609)
        at 
org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:547)
        at 
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:295
{code}

> 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: 6.2, 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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