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https://issues.apache.org/jira/browse/SOLR-10885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16257873#comment-16257873
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Varun Thacker commented on SOLR-10885:
--------------------------------------
Makes sense . I'll add some wording. Thanks for reporting
> NullPointerException when run collapse filter
> ----------------------------------------------
>
> Key: SOLR-10885
> URL: https://issues.apache.org/jira/browse/SOLR-10885
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: search
> Affects Versions: 6.4.1
> Reporter: jefferyyuan
> Assignee: Varun Thacker
> Priority: Critical
>
> Solr collapse is a great function to collapse data that is related so we only
> show one in search result.
> Just found one issue related with it - It throw NullPointerException in some
> cases.
> To reproduce it, first ingest some data - AND commit multiple times.
> 1. When there is no data that matches the query:
> http://localhost:8983/solr/thecollection/select?defType=edismax&q=non-existType:*&fq={!collapse
> field=seriesId nullPolicy=expand}&fq={!collapse field=programId
> nullPolicy=expand}
> - But the problem only happens if I use both collapse fqs, if I just use one
> of them, it would be fine.
> *2. When the data that matches the query doesn't have the collapse fields
> - This is kind of a big problem as we may store different kinds of docs in
> one collection, one query may match different kinds of docs.
> If some docs (docType1) have same value for field1, we want to collapse
> them, if other dosc(docType2) have some value for field2, do same things.*
> - channel data doesn't have seriesId or programId
> http://localhost:8983/solr/thecollection/select?defType=edismax&q=docType:channel&fq={!collapse
> field=seriesId nullPolicy=expand}&fq={!collapse field=programId
> nullPolicy=expand}
> - But the problem only happens if I use both collapse fqs, if I just use one
> of them, it would be fine.
> Exception from log:
> Caused by:
> org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException: Error
> from server at http://localhost:8983/solr/searchItems_shard1_replica3:
> java.lang.NullPointerException
> at
> org.apache.solr.search.CollapsingQParserPlugin$OrdScoreCollector.finish(CollapsingQParserPlugin.java:617)
> at
> org.apache.solr.search.CollapsingQParserPlugin$OrdScoreCollector.finish(CollapsingQParserPlugin.java:667)
> at
> org.apache.solr.search.SolrIndexSearcher.buildAndRunCollectorChain(SolrIndexSearcher.java:256)
> at
> org.apache.solr.search.SolrIndexSearcher.getDocListNC(SolrIndexSearcher.java:1823)
> at
> org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:1640)
> at
> org.apache.solr.search.SolrIndexSearcher.search(SolrIndexSearcher.java:611)
> at
> org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:533)
> at
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:295)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:166)
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:2299)
> at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:658)
> at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:464)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:345)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:296)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1691)
> at
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
> at
> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
> at
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180)
> at
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512)
> at
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
> at
> org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)
> at
> org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119)
> at
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
> int nextDocBase = currentContext + 1 < this.contexts.length ?
> this.contexts[(currentContext + 1)].docBase : this.maxDoc; - 617 from solr
> 6.4.1 CollapsingQParserPlugin.java
> Seems related with https://issues.apache.org/jira/browse/SOLR-8807
> - But SOLR-8807 only fixes issue related with spell checker.
> I may test this with latest solr 6.6.0 when I have time.
> Updated:
> Whether solr supports multiple collapse fields?
> - Seems the query occasionally works (1/10 maybe), but othertimes it throws
> NullPointerException
> http://localhost:18983/solr/thecollection/select?q=programId:* AND
> id:*&defType=edismax&fq={!collapse+field=id }&fq={!collapse+field=programId }
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