presto-hive/src/main/java/io/prestosql/plugin/hive/metastore/SortingColumn.java/SortingColumn/SortingColumn
class SortingColumn:    @JsonCreator
    public SortingColumn(
            @JsonProperty("columnName") String columnName,
            @JsonProperty("order") Order order)
    {
        this.columnName = requireNonNull(columnName, "columnName is null");
        this.order = requireNonNull(order, "order is null");
    }