public override string ToString() {
StringBuilder sb = new StringBuilder("insert_args(");
sb.Append("Key: ");
sb.Append(Key);
sb.Append(",Column_parent: ");
sb.Append(Column_parent== null ? "<null>" : Column_parent.ToString());
sb.Append(",Column: ");
sb.Append(Column== null ? "<null>" : Column.ToString());
sb.Append(",Consistency_level: ");
sb.Append(Consistency_level);
sb.Append(")");
return sb.ToString();
}