presto-hive/src/main/java/io/prestosql/plugin/hive/HiveAnalyzeProperties.java/HiveAnalyzeProperties/getPartitionList
class HiveAnalyzeProperties:    @SuppressWarnings("unchecked")
    public static Optional<List<List<String>>> getPartitionList(Map<String, Object> properties)
    {
        List<List<String>> partitions = (List<List<String>>) properties.get(PARTITIONS_PROPERTY);
        return Optional.ofNullable(partitions);
    }