public ColumnInfo columnUrlId() {
        return _columnUrlId;
    }

    public ColumnInfo columnDocId() {
        return _columnDocId;
    }

    public ColumnInfo columnOrder() {
        return _columnOrder;
    }

    public ColumnInfo columnQueryId() {
        return _columnQueryId;
    }

    public ColumnInfo columnQueryRequestedAt() {
        return _columnQueryRequestedAt;