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List:       solr-user
Subject:    NullPointerException with ExpandComponent on Collapsed Null Values
From:       "austin () 3bx ! org ! INVALID" <austin () 3bx ! org ! INVALID>
Date:       2019-05-28 20:22:27
Message-ID: CACW+VQ_FPED821pAL83eiz90ev9q2ZE1yDwZd20wkUjdv1NtiQ () mail ! gmail ! com
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Hi all,



I'm currently running 7.5.0 and am looking to use the collapse and expand
results functionality.



The field I'm attempting to collapse on is an "int" field that isn't
required, and I'm using a null policy of expand to create a unique group
for each document that has a missing field.   The majority of documents *are
*missing this field at this time.



I'm running into a NullPointerException on the response from within the
ExpandComponent.  I've also tried the grouping with a field where I've
generated an ID (to cause the field to never be null), which seems to
resolve the issue.  I'm wondering if there's some type of issue with how
Solr is handling the expansion of these null records.



Any thoughts?





Here's an example request:



https://localhost:8985/solr/products/select?fq=%7B!collapse%20field%3DGroupId_i%20null \
Policy%3Dexpand%7D&qf=Name%5E100&start=0&rows=5&version=2.2&q=test&expand=true&expand.rows=1&sort=score%20desc&fl=ItemId




… and the response



<?xml version="1.0" encoding="UTF-8"?>

<response>

   <lst name="responseHeader">

      <bool name="zkConnected">true</bool>

      <int name="status">500</int>

      <int name="QTime">19</int>

      <lst name="params">

         <str name="q">test</str>

         <str name="expand">true</str>

         <str name="expand.rows">1</str>

         <str name="qf">Name^100</str>

         <str name="fl">ItemId</str>

         <str name="start">0</str>

         <str name="fq">{!collapse field=GroupId_i nullPolicy=expand}</str>

         <str name="sort">score desc</str>

         <str name="rows">5</str>

         <str name="version">2.2</str>

      </lst>

   </lst>

   <result name="response" numFound="46086" start="0">

      <doc>

         <int name="ItemId">186209</int>

      </doc>

      <doc>

         <int name="ItemId">3516830</int>

      </doc>

      <doc>

         <int name="ItemId">9764413</int>

      </doc>

      <doc>

         <int name="ProductID">9764705</int>

      </doc>

      <doc>

        <int name="ItemId">9764767</int>

      </doc>

   </result>

   <lst name="error">

      <str name="trace">java.lang.NullPointerException

        at
org.apache.solr.handler.component.ExpandComponent.process(ExpandComponent.java:351)

        at
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:298)


        at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:199)

        at org.apache.solr.core.SolrCore.execute(SolrCore.java:2541)

        at
org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:709)

        at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:515)

        at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:377)

        at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:323)

        at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1634)


        at
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)

        at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)

        at
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)

        at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)

        at
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)

        at
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)

        at
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)

        at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1317)

        at
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)

        at
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)

        at
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)

        at
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)

        at
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1219)

        at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)

        at
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:219)


        at
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)

        at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)

        at
org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335)

        at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)

        at org.eclipse.jetty.server.Server.handle(Server.java:531)

        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352)

        at
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)

        at
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)


        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)

        at
org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)

        at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)


        at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)


        at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)


        at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)

        at
org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)


        at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:762)

        at
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:680)

        at java.base/java.lang.Thread.run(Thread.java:834)</str>

      <int name="code">500</int>

   </lst>

</response>



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