[SOLR-8397] Join query can sometimes throw an exception if highlighted

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 5.3
• Component/s: highlighter

Environment

SolrCloud 5.3.1

• Assignee: Unassigned
• Reporter: Peter Ciuffetti
• Created: 09/Dec/15 21:39
• Updated: 10/Dec/15 03:41

Description

If you use the combination of a join query with the 'old' QueryScorer as a highlighter, you get a classcast exception

java.lang.ClassCastException: org.apache.lucene.search.IndexSearcher cannot be cast to org.apache.solr.search.SolrIndexSearcher
	at org.apache.solr.search.JoinQuery.createWeight(JoinQParserPlugin.java:217)
	at org.apache.lucene.search.IndexSearcher.createWeight(IndexSearcher.java:855)
	at org.apache.lucene.search.IndexSearcher.createNormalizedWeight(IndexSearcher.java:838)
	at org.apache.lucene.search.highlight.QueryTermExtractor.getTerms(QueryTermExtractor.java:131)
	at org.apache.lucene.search.highlight.QueryTermExtractor.getTerms(QueryTermExtractor.java:106)
	at org.apache.lucene.search.highlight.QueryTermExtractor.getTerms(QueryTermExtractor.java:119)
	at org.apache.lucene.search.highlight.QueryTermExtractor.getTerms(QueryTermExtractor.java:62)
	at org.apache.lucene.search.highlight.QueryTermScorer.<init>(QueryTermScorer.java:52)
	at org.apache.solr.highlight.DefaultSolrHighlighter.getQueryScorer(DefaultSolrHighlighter.java:244)
	at org.apache.solr.highlight.DefaultSolrHighlighter.getHighlighter(DefaultSolrHighlighter.java:197)
	at org.apache.solr.highlight.DefaultSolrHighlighter.doHighlightingByHighlighter(DefaultSolrHighlighter.java:586)
	at org.apache.solr.highlight.DefaultSolrHighlighter.doHighlighting(DefaultSolrHighlighter.java:428)
	at org.apache.solr.handler.component.HighlightComponent.process(HighlightComponent.java:143)
	at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:277)
	at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:143)

the query parameters that will produce this are

?hl=true
&hl.usePhraseHighlighter=false
&hl.fl=somefield
&q={!join from=x to=y}somequery

This does not happen when the default SpanScorer is used (which happens when hl.usePhraseHighlighter=true or is unspecified)

Issue Links

• relates to: SOLR-6357 Using query time Join in deleteByQuery throws ClassCastException