public JLGGroupData mapRowData(ResultSet rs, int rowNum) throws SQLException {
      final List<JLGClientData> clients = new ArrayList<>();
      final JLGGroupData group = this.mapRow(rs, rowNum);
      final Long previousGroupId = group.getGroupId();

      // first client row of new group
      JLGClientData client = clientSavingsDataMapper.mapRowData(rs, rowNum);
      clients.add(client);

      // if its not after last row loop
      while (!rs.isAfterLast()) {
        final Long groupId = JdbcSupport.getLong(rs, "groupId");
        if (previousGroupId != null && groupId.compareTo(previousGroupId) != 0) {
          // return for next group details
          return JLGGroupData.withClients(group, clients);
        }
        client = clientSavingsDataMapper.mapRowData(rs, rowNum);
        clients.add(client);
      }

      return JLGGroupData.withClients(group, clients);
    }