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https://issues.apache.org/jira/browse/SOLR-8319?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17158575#comment-17158575
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Yunus edited comment on SOLR-8319 at 7/15/20, 5:49 PM:
-------------------------------------------------------

Solr: 6.6.2
 Hello guys just to add to the topic. First I would like to thank you 
[~igiguere]. I have now some hope of fixing this issue myself by patching it if 
necessary. I have the same problem as reported in 
https://issues.apache.org/jira/browse/SOLR-8921 .

Our system use distributed Solr and our application use faceting on text 
fields. Faceting on them can return a lot of terms so we used a limit of 50. 
After testing multiple requests I noticed that playing on facet.limit allowed 
me to get back values and not a NPE. So I read back again the doc on faceting 
and google a lot until I found : [https://stackoverflow.com/a/36779784] 
 As sugested in the post, I added over-request parameters 
[https://lucene.apache.org/solr/guide/6_6/faceting.html#Faceting-Over-RequestParameters]
 and it is working correctly now. I do not undestand why It has an effect on my 
request :/ this topic is a bit complicated for me.
 I hope it can help to bring some light on the problem.


was (Author: ybviavoo):
Solr: 6.6.2
Hello guys just to add to the topic. First I would like to thank you 
[~igiguere]. I have now some hope of fixing this issue myself by patching it if 
necessary. I have the same problem as reported in 
https://issues.apache.org/jira/browse/SOLR-8921 .

Our system use distributed Solr and our application use faceting on text 
fields. Faceting on them can return a lot of terms so we used a limit of 50. 
After testing multiple requests I noticed that playing on facet.limit allowed 
me to get back values and not a NPE. So I read back again the doc on faceting 
and google a lot until I found : [https://stackoverflow.com/a/36779784] 
As sugested in the post, I added over-request parameters 
[https://lucene.apache.org/solr/guide/6_6/faceting.html#Faceting-Over-RequestParameters]
 and it is working correctly now.
I hope it can help to bring some light on the problem.

> NPE when creating pivot
> -----------------------
>
>                 Key: SOLR-8319
>                 URL: https://issues.apache.org/jira/browse/SOLR-8319
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Neil Ireson
>            Priority: Major
>         Attachments: SOLR-8319.patch
>
>
> I get a NPE, the trace is shown at the end.
> The problem seems to be this line in the getSubset method:
>       Query query = ft.getFieldQuery(null, field, pivotValue);
> Which takes a value from the index and then analyses it to create a query. I 
> believe the problem is that when my analysis process is applied twice it 
> results in a null query. OK this might be seen as my issue because of dodgy 
> analysis, I thought it might be because I have the wrong order with 
> LengthFilterFactory before EnglishPossessiveFilterFactory and 
> KStemFilterFactory, i.e.:
>                 <filter class="solr.LengthFilterFactory" min="3" max="32"/>
>                 <filter class="solr.EnglishPossessiveFilterFactory"/>
>                 <filter class="solr.KStemFilterFactory"/> 
> So that "cat's" -> "cat" -> "", however any filter order I tried still 
> resulted in a NPE, and perhaps there is a viable case where parsing a term 
> twice results in a null query.
> The thing is I don't see why when the query term comes from the index it has 
> to undergo any analysis. If the term is from the index can it not simply be 
> created using a TermQuery, which I would imagine would also be faster. I 
> altered the "getFieldQuery" line above to the following and that has fixed my 
> NPE issue.
>       Query query = new TermQuery(new Term(field.getName(), pivotValue));
> So far this hasn't caused any other issues but perhaps that is due to my use 
> of Solr, rather than actually fixing an issue. 
> o.a.s.c.SolrCore java.lang.NullPointerException
>         at 
> java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)
>         at 
> org.apache.solr.util.ConcurrentLRUCache.get(ConcurrentLRUCache.java:91)
>         at org.apache.solr.search.FastLRUCache.get(FastLRUCache.java:130)
>         at 
> org.apache.solr.search.SolrIndexSearcher.getDocSet(SolrIndexSearcher.java:1296)
>         at 
> org.apache.solr.handler.component.PivotFacetProcessor.getSubset(PivotFacetProcessor.java:375)
>         at 
> org.apache.solr.handler.component.PivotFacetProcessor.doPivots(PivotFacetProcessor.java:305)
>         at 
> org.apache.solr.handler.component.PivotFacetProcessor.processSingle(PivotFacetProcessor.java:228)
>         at 
> org.apache.solr.handler.component.PivotFacetProcessor.process(PivotFacetProcessor.java:170)
>         at 
> org.apache.solr.handler.component.FacetComponent.process(FacetComponent.java:262)
>         at 
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:277)
>         at 
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:143)
>         at org.apache.solr.core.SolrCore.execute(SolrCore.java:2068)
>         at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:669)
>         at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:462)
>         at 
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:214)
>         at 
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:179)
>         at 
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
>         at 
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
>         at 
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
>         at 
> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
>         at 
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
>         at 
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
>         at 
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
>         at 
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
>         at 
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
>         at 
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
>         at 
> org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215)
>         at 
> org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)
>         at 
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
>         at org.eclipse.jetty.server.Server.handle(Server.java:499)
>         at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)
>         at 
> org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
>         at 
> org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)
>         at 
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
>         at 
> org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
>         at java.lang.Thread.run(Thread.java:745)



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