@Data
@QuerySqlField.Group(
    indexes = {
        @QuerySqlField.Index(name = "idx_salary", fields = {"salary"}),
        @QuerySqlField.Index(name = "idx_dept_salary", fields = {"department", "salary"})
    }
)
public class Employee {
    @QuerySqlField(index = true)
    private long id;
    
    @QuerySqlField(index = true)
    private String name;
    
    @QuerySqlField
    private String department;
    
    @QuerySqlField
    private double salary;
}