presto-hive/src/main/java/io/prestosql/plugin/hive/HiveTableProperties.java/HiveTableProperties/getBucketedBy
class HiveTableProperties:    @SuppressWarnings("unchecked")
    private static List<String> getBucketedBy(Map<String, Object> tableProperties)
    {
        return (List<String>) tableProperties.get(BUCKETED_BY_PROPERTY);
    }