public override string ToString()
{
StringBuilder sb = new StringBuilder("alter_partition_args(");
sb.Append("Db_name: ");
sb.Append(Db_name);
sb.Append(",Tbl_name: ");
sb.Append(Tbl_name);
sb.Append(",New_part: ");
sb.Append(New_part == null ? "<null>" : New_part.ToString());
sb.Append(")");
return sb.ToString();
}