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https://issues.apache.org/jira/browse/SOLR-6203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15579056#comment-15579056
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ASF subversion and git services commented on SOLR-6203:
-------------------------------------------------------

Commit a4a314d1602458cd7427b337d32eca60049c72da in lucene-solr's branch 
refs/heads/master from [~cpoerschke]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=a4a314d ]

SOLR-6203: in QueryComponent rename groupSortStr to sortWithinGroupStr (so that 
name and meaning match)


> cast exception while searching with sort function and result grouping
> ---------------------------------------------------------------------
>
>                 Key: SOLR-6203
>                 URL: https://issues.apache.org/jira/browse/SOLR-6203
>             Project: Solr
>          Issue Type: Bug
>          Components: search
>    Affects Versions: 4.7, 4.8
>            Reporter: Nate Dire
>            Assignee: Christine Poerschke
>         Attachments: README, SOLR-6203-unittest.patch, SOLR-6203.patch
>
>
> 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):
> # Add {{"*"}} dynamic field as a {{TextField}}, eg:
> {noformat}
> <dynamicField name="*" type="text_general" multiValued="true" />
> {noformat}
> #  Create  sharded collection
> {noformat}
> curl 
> 'http://localhost:8983/solr/admin/collections?action=CREATE&name=test&numShards=2&maxShardsPerNode=2'
> {noformat}
> # Add example docs (query must have some results)
> # Submit query which sorts on a function result and uses result grouping:
> {noformat}
> {
>   "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
>   }
> }
> {noformat}
> Source exception from log:
> {noformat}
> 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)
>   ...
> {noformat}
> It looks like {{serializeSearchGroup}} is matching the sort expression as the 
> {{"*"}} dynamic field, which is a TextField in the repro.



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