public Set<TableDescription> getTablesDescriptions() {
        Set<String> tableNameSet = tableHashMap.keySet();
        Set<TableDescription> tableDescriptions = new TreeSet<TableDescription>();
        for (String tableName : tableNameSet) {
            Table table = tableHashMap.get(tableName);
            TableDescription tableDescription = table.getTableDescription();
            tableDescriptions.add(tableDescription);
        }
        return tableDescriptions;
    }