presto-main/src/main/java/io/prestosql/execution/Column.java/Column/Column
class Column:    @JsonCreator
    public Column(
            @JsonProperty("name") String name,
            @JsonProperty("type") String type)
    {
        this.name = requireNonNull(name, "name is null");
        this.type = requireNonNull(type, "type is null");
    }