[SOLR-13877] NPE in ExpandComponent

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 8.4
• Labels: collapse expand
• Assignee: Munendra S N
• Reporter: Munendra S N
• Created: 28/Oct/19 15:53
• Updated: 21/Jan/20 16:59
• Resolved: 29/Oct/19 08:54

Description

Truncated Stack trace

Caused by: java.lang.NullPointerException
	at org.apache.lucene.util.BytesRef.compareTo(BytesRef.java:162)
	at org.apache.lucene.util.BytesRef.compareTo(BytesRef.java:36)
	at java.base/java.util.Comparators$NaturalOrderComparator.compare(Comparators.java:52)
	at java.base/java.util.Comparators$NaturalOrderComparator.compare(Comparators.java:47)
	at org.apache.lucene.util.ArrayTimSorter.compare(ArrayTimSorter.java:48)
	at org.apache.lucene.util.TimSorter.nextRun(TimSorter.java:109)
	at org.apache.lucene.util.TimSorter.sort(TimSorter.java:201)
	at org.apache.lucene.util.ArrayUtil.timSort(ArrayUtil.java:452)
	at org.apache.lucene.util.ArrayUtil.timSort(ArrayUtil.java:471)
	at org.apache.lucene.util.ArrayUtil.timSort(ArrayUtil.java:479)
	at org.apache.lucene.search.TermInSetQuery.<init>(TermInSetQuery.java:85)
	at org.apache.lucene.search.TermInSetQuery.<init>(TermInSetQuery.java:107)
	at org.apache.solr.handler.component.ExpandComponent.getGroupQuery(ExpandComponent.java:746)
	at org.apache.solr.handler.component.ExpandComponent.process(ExpandComponent.java:330)
	at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:328)
	at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:198)
	at org.apache.solr.core.SolrCore.execute(SolrCore.java:2583)
	at org.apache.solr.util.TestHarness.query(TestHarness.java:339)
	at org.apache.solr.util.TestHarness.query(TestHarness.java:321)
	at org.apache.solr.SolrTestCaseJ4.assertQ(SolrTestCaseJ4.java:972)

This could happen when expand component is used without collapse and docs returned have fewer unique values