protected void addColumnsToUpgradeTable() throws SQLException {
    dbAccessor.addColumn(UPGRADE_TABLE,
        new DBAccessor.DBColumnInfo(UPGRADE_PACK_STACK_ID, String.class, 255,
            "", false));
  }
The {@link UpgradeCatalog280} upgrades Ambari from 2.7.2 to 2.8.0.
ambari-server/src/main/java/org/apache/ambari/server/upgrade/UpgradeCatalog280.java