Hi Bryan, What is the fieldtype of the groupField? You can only group by field that is of type string as is described in the wiki: http://wiki.apache.org/solr/FieldCollapsing#Request_Parameters
When you group by another field type a http 400 should be returned instead if this error. At least that what I'd expect. Martijn On 20 June 2012 20:37, Bryan Loofbourrow <bloofbour...@knowledgemosaic.com> wrote: > I am doing a search on three shards with identical schemas (I > double-checked!), using the group feature, and Solr/Lucene 3.5. Solr is > giving me back the exception listed at the bottom of this email: > > > > Other information: > > > > My schema uses the following field types: StrField, DateField, > TrieDateField, TextField, SortableInt, SortableLong, BoolField > > > > My query looks like this (I’ve messed with it to anonymize but, I hope, > kept the essentials: > > > > http://[solr core2] /select/?&start=0&rows=25&q={!qsol}machines&sort=[sort > field] &fl=[list of fields] &shards=[solr core1]%2c[solr core2]%2c[solr > core3]&group=true&group.field=[group field] > > > > java.lang.ClassCastException: java.util.Date cannot be cast to > java.lang.String > > at > org.apache.lucene.search.FieldComparator$StringOrdValComparator.compareValues(FieldComparator.java:844) > > at > org.apache.lucene.search.grouping.SearchGroup$GroupComparator.compare(SearchGroup.java:180) > > at > org.apache.lucene.search.grouping.SearchGroup$GroupComparator.compare(SearchGroup.java:154) > > at java.util.TreeMap.put(TreeMap.java:547) > > at java.util.TreeSet.add(TreeSet.java:255) > > at > org.apache.lucene.search.grouping.SearchGroup$GroupMerger.updateNextGroup(SearchGroup.java:222) > > at > org.apache.lucene.search.grouping.SearchGroup$GroupMerger.merge(SearchGroup.java:285) > > at > org.apache.lucene.search.grouping.SearchGroup.merge(SearchGroup.java:340) > > at > org.apache.solr.search.grouping.distributed.responseprocessor.SearchGroupShardResponseProcessor.process(SearchGroupShardResponseProcessor.java:77) > > at > org.apache.solr.handler.component.QueryComponent.handleGroupedResponses(QueryComponent.java:565) > > at > org.apache.solr.handler.component.QueryComponent.handleResponses(QueryComponent.java:548) > > at > org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:289) > > at > org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:129) > > at org.apache.solr.core.SolrCore.execute(SolrCore.java:1372) > > at > org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:356) > > at > org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:252) > > at > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) > > at > org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) > > at > org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) > > at > org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) > > at > org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) > > at > org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) > > at > org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) > > at > org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) > > at > org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859) > > at > org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602) > > at > org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) > > at java.lang.Thread.run(Thread.java:679) > > > > Any thoughts or advice? > > > > Thanks, > > > > -- Bryan -- Met vriendelijke groet, Martijn van Groningen
