fix pg mapper

bigtop-manager-dao/src/main/resources/mapper/postgresql/ClusterMapper.xml

@@ -38,10 +38,11 @@
         count(h.id) as total_host, sum(h.available_processors) as total_processor,
         sum(h.total_memory_size) as total_memory, sum(h.total_disk) as total_disk, count(s.id) as total_service
         from
-        cluster c left join user u on c.create_by = u.id
+        cluster c left join "user" u on c.create_by = u.id
         left join host h on c.id = h.cluster_id
         left join service s on c.id = s.cluster_id
         where c.id = #{id}
+        group by c.id, u.nickname
         limit 1
     </select>