Adding a condition to cast QueryNode to SingleResourceCastNode for Unquoted Type Parameter

[WanjohiSammy]

Issues

This pull request fixes #1304.

Description

This modification adds a condition to cast QueryNode to SingleResourceCastNode.

Currently, the QueryNode is only converted to ConstantNode and supports the cast function only with quoted type parameters. For unquoted type parameters, the QueryNode will be of type SingleResourceCastNode, resulting in an error because SingleResourceCastNode cannot be cast to ConstantNode.

For example, given the following entities:

namespace NS;

public class Person
{
    public int Id { get; set; }
    public string FullName { get; set; }
    public MyAddress Location { get; set; }
}

public class Employee : Person
{
    public string EmployeeNumber { get; set; }
}

public class MyAddress
{
    public string Street { get; set; }
}

public class WorkAddress : MyAddress
{
    public string OfficeNumber { get; set; }
}

With this change, we should be able to support these casts with unquoted type parameters:

• cast(NS.Employee): cast Person to Employee
• cast(Location, NS.WorkAddress): cast Location property to NS.WorkAddress

The following are currently supported :

• cast('NS.Employee'): Quoted Employee type
• cast(Location, 'NS.WorkAddress'): Quoted WorkAddress type

Checklist (Uncheck if it is not completed)

• Test cases added
• Build and test with one-click build and test script passed

Additional work necessary

If documentation update is needed, please add "Docs Needed" label to the issue and provide details about the required document change in the issue.