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https://issues.apache.org/jira/browse/SOLR-8291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15004938#comment-15004938
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Ray commented on SOLR-8291:
---------------------------

Hi Joel:
   1. I am not using CollapsingQParserPlugin, here is my query:, I found id1 
and id2 sometimes had null values
   
http://host/solr/collection/export?q=date:[NOW+TO+*]&distrib=false&fl=id1,id2,doubleValue1&sort=doubleValue1+desc
   2. We don't have custom PostFilter, here is the configure for export handler:
        <requestHandler name="/export" class="solr.SearchHandler">
          <lst name="invariants">
            <str name="rq">{!xport}</str>
            <str name="wt">xsort</str>
            <str name="distrib">false</str>
          </lst>
          <arr name="components">
            <str>query</str>
          </arr>
        </requestHandler>



> Get NPE during calling export handler
> -------------------------------------
>
>                 Key: SOLR-8291
>                 URL: https://issues.apache.org/jira/browse/SOLR-8291
>             Project: Solr
>          Issue Type: Bug
>          Components: SolrCloud
>    Affects Versions: 5.2.1
>            Reporter: Ray
>
> Get NPE during calling export handler, here is the stack trace:
>       at org.apache.lucene.util.BitSetIterator.<init>(BitSetIterator.java:58)
>       at 
> org.apache.solr.response.SortingResponseWriter.write(SortingResponseWriter.java:138)
>       at 
> org.apache.solr.response.QueryResponseWriterUtil.writeQueryResponse(QueryResponseWriterUtil.java:53)
>       at 
> org.apache.solr.servlet.HttpSolrCall.writeResponse(HttpSolrCall.java:727)
>       at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:459)
>       at 
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:227)
>       at 
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:196)
>       at 
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:274)
>       at 
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242)
>       at 
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:274)
>       at 
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242)
>       at 
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275)
>       at 
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
>       at 
> org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:181)
>       at 
> org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.event(CatalinaContext.java:285)
>       at 
> org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.invoke(CatalinaContext.java:261)
>       at 
> org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:88)
>       at 
> org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:100)
>       at 
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:159)
>       at 
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
>       at 
> org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
>       at 
> org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:567)
>       at 
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
>       at 
> org.jboss.web.tomcat.service.request.ActiveRequestResponseCacheValve.invoke(ActiveRequestResponseCacheValve.java:53)
>       at 
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362)
>       at 
> org.apache.coyote.ajp.AjpAprProcessor.process(AjpAprProcessor.java:489)
>       at 
> org.apache.coyote.ajp.AjpAprProtocol$AjpConnectionHandler.process(AjpAprProtocol.java:452)
>       at 
> org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:2019)
>       at java.lang.Thread.run(Thread.java:745)
> It seems there are some FixedBitSet was set to null



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