protected void removeSupersetFromDruid() throws SQLException {
    removeComponent("DRUID_SUPERSET", "druid-superset");
  }
get {@value #REPO_VERSION_ID_COLUMN} value from {@value #CLUSTER_VERSION_TABLE}
where {@value #STATE_COLUMN} = {@value #CURRENT}
and validate it

@return current version ID or null if no cluster versions do exist
@throws AmbariException if cluster versions are present, but current is not selected
@throws SQLException
ambari-server/src/main/java/org/apache/ambari/server/upgrade/UpgradeCatalog260.java