[SOLR-6203] cast exception while searching with sort function and result grouping

• Type: Bug
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 4.7, 4.8
• Component/s: search
• Assignee: Unassigned
• Reporter: Nate Dire
• Created: 25/Jun/14 20:07
• Updated: 13/May/20 13:33

Description

After upgrading from 4.5.1 to 4.7+, a schema including a "*" dynamic field as text gets a cast exception when using a sort function and result grouping.

Repro (with example config):

1. Add "*" dynamic field as a TextField, eg:

   <dynamicField name="*" type="text_general" multiValued="true" />
   

2. Create sharded collection

   curl 'http://localhost:8983/solr/admin/collections?action=CREATE&name=test&numShards=2&maxShardsPerNode=2'
   

3. Add example docs (query must have some results)
4. Submit query which sorts on a function result and uses result grouping:

   {
     "responseHeader": {
       "status": 500,
       "QTime": 50,
       "params": {
         "sort": "sqrt(popularity) desc",
         "indent": "true",
         "q": "*:*",
         "_": "1403709010008",
         "group.field": "manu",
         "group": "true",
         "wt": "json"
       }
     },
     "error": {
       "msg": "java.lang.Double cannot be cast to org.apache.lucene.util.BytesRef",
       "code": 500
     }
   }
   

Source exception from log:

ERROR - 2014-06-25 08:10:10.055; org.apache.solr.common.SolrException; java.lang.ClassCastException: java.lang.Double cannot be cast to org.apache.lucene.util.BytesRef
    at org.apache.solr.schema.FieldType.marshalStringSortValue(FieldType.java:981)
    at org.apache.solr.schema.TextField.marshalSortValue(TextField.java:176)
    at org.apache.solr.search.grouping.distributed.shardresultserializer.SearchGroupsResultTransformer.serializeSearchGroup(SearchGroupsResultTransformer.java:125)
    at org.apache.solr.search.grouping.distributed.shardresultserializer.SearchGroupsResultTransformer.transform(SearchGroupsResultTransformer.java:65)
    at org.apache.solr.search.grouping.distributed.shardresultserializer.SearchGroupsResultTransformer.transform(SearchGroupsResultTransformer.java:43)
    at org.apache.solr.search.grouping.CommandHandler.processResult(CommandHandler.java:193)
    at org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:340)
    at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:218)
    at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)
  ...

It looks like serializeSearchGroup is matching the sort expression as the "*" dynamic field, which is a TextField in the repro.

Issue Links

• is duplicated by: SOLR-11961 group.query and sort with function getting error in solrcloud
• is related to: SOLR-11042 Sort by function query: throw exception if can't parse
• is related to: SOLR-10659 remove ResponseBuilder.getSortSpec use in SearchGroupShardResponseProcessor
• relates to: SOLR-9627 add QParser.getSortSpec, deprecate misleadingly named QParser.getSort
• relates to: SOLR-9660 in GroupingSpecification factor [group](sort|offset|limit) into [group](sortSpec)
• relates to: SOLR-9783 remove no-longer-needed sortWithinGroup null checks in (Search|Top)Group[s]ShardResponseProcessor
• relates to: SOLR-9890 factor out ShardResultTransformerUtils.[un]marshSortValue methods
• relates to: SOLR-10394 search.grouping.Command rename: getSortWithinGroup --> getWithinGroupSort