public override object Clone()
        {
            SQLiteVariableExpression res = new SQLiteVariableExpression();

            res._variable = _variable;
            return(res);
        }
        public override bool Equals(object obj)
        {
            if (obj == null)
            {
                return(false);
            }

            SQLiteVariableExpression dst = obj as SQLiteVariableExpression;

            if (dst == null)
            {
                return(false);
            }

            if (_variable != dst._variable)
            {
                return(false);
            }

            return(base.Equals(obj));
        }