presto-hive/src/main/java/io/prestosql/plugin/hive/metastore/StorageFormat.java/StorageFormat/getOutputFormat
class StorageFormat:    public String getOutputFormat()
    {
        if (outputFormat == null) {
            throw new PrestoException(HIVE_UNSUPPORTED_FORMAT, "OutputFormat is not present in StorageFormat");
        }
        return outputFormat;
    }