Hi, I'm doing a simple *:* search on an empty multi sharded collection using Solr 7.6 and am getting this exception:
NullPointerException at org.apache.solr.handler.component.QueryComponent.unmarshalSortValues(QueryComponent.java:1034) at org.apache.solr.handler.component.QueryComponent.mergeIds(QueryComponent.java:885) at org.apache.solr.handler.component.QueryComponent.handleRegularResponses(QueryComponent.java:585) at org.apache.solr.handler.component.QueryComponent.handleResponses(QueryComponent.java:564) at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:426) at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:199) at org.apache.solr.core.SolrCore.execute(SolrCore.java:2541) This is the same exception as reported in https://issues.apache.org/jira/browse/SOLR-12060 and likely also https://issues.apache.org/jira/browse/SOLR-11643. Sometimes I can do multiple requests and some work and some pass. And this test is done on a single node that for testing uses a collection with four shards. I looked a bit into the code: https://github.com/apache/lucene-solr/blob/branch_7_6/solr/core/src/java/org/apache/solr/handler/component/QueryComponent.java I seems like https://github.com/apache/lucene-solr/blob/branch_7_6/solr/core/src/java/org/apache/solr/handler/component/QueryComponent.java#L884 return null. This should mean that https://github.com/apache/lucene-solr/blob/branch_7_6/solr/core/src/java/org/apache/solr/handler/component/QueryComponent.java#L482 did not get invoked, which would happen if FIELD_SORT_VALUES is not set to true. And indeed if I add fsv=true to my query the NPE does not show up. So there are a few questions: 1) what is fsv=true about? 2) why do I need to set it? 3) why don't I get the NPE all the time? Earlier it looked as if the problem only showed up if I enabled the suggester or spellcheck component. But after having done tons of tests things are not that consistent. thanks, Hendrik
