presto-kafka/src/main/java/io/prestosql/plugin/kafka/KafkaInternalFieldDescription.java/KafkaInternalFieldDescription/KafkaInternalFieldDescription
class KafkaInternalFieldDescription:    KafkaInternalFieldDescription(
            String columnName,
            Type type,
            String comment)
    {
        checkArgument(!isNullOrEmpty(columnName), "name is null or is empty");
        this.columnName = columnName;
        this.type = requireNonNull(type, "type is null");
        this.comment = requireNonNull(comment, "comment is null");
    }