presto-hive/src/main/java/io/prestosql/plugin/hive/metastore/StorageFormat.java/StorageFormat/createNullable
class StorageFormat:    @JsonCreator
    public static StorageFormat createNullable(
            @JsonProperty("serDe") String serDe,
            @JsonProperty("inputFormat") String inputFormat,
            @JsonProperty("outputFormat") String outputFormat)
    {
        return new StorageFormat(serDe, inputFormat, outputFormat);
    }