SolrQuery::addGroupFunction
  Allows grouping results based on the unique values of a function query (group.func parameter).
  
 
  Description
  
   public SolrQuery SolrQuery::addGroupFunction
    ( string $value
   )
  
  
 
 
 
  See Also
  
   -  SolrQuery::setGroup
-  SolrQuery::addGroupField
-  SolrQuery::addGroupQuery
-  SolrQuery::addGroupSortField
-  SolrQuery::setGroupFacet
-  SolrQuery::setGroupOffset
-  SolrQuery::setGroupLimit
-  SolrQuery::setGroupMain
-  SolrQuery::setGroupNGroups
-  SolrQuery::setGroupTruncate
-  SolrQuery::setGroupFormat
-  SolrQuery::setGroupCachePercent