support for partial/filtered indices on SQL Server 2008

Author: romuloceccon

lib/active_record/connection_adapters/sqlserver_adapter.rb

@@ -252,6 +252,10 @@ def supports_index_sort_order?
         true
       end
 
+      def supports_partial_index?
+        @database_year >= 2008
+      end
+
       def supports_explain?
         true
       end