presto-hive/src/main/java/io/prestosql/plugin/hive/HivePartitionKey.java/HivePartitionKey/HivePartitionKey
class HivePartitionKey:    @JsonCreator
    public HivePartitionKey(
            @JsonProperty("name") String name,
            @JsonProperty("value") String value)
    {
        requireNonNull(name, "name is null");
        requireNonNull(value, "value is null");

        this.name = name;
        this.value = value.equals(HIVE_DEFAULT_DYNAMIC_PARTITION) ? "\\N" : value;
    }