[OASIS Issue Tracker] Created: (ODATA-280) Support cast segment in $expand

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

Support cast segment in $expand
-------------------------------

                 Key: ODATA-280
                 URL: http://tools.oasis-open.org/issues/browse/ODATA-280
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Improvement
          Components: OData ABNF Construction Rules, OData Protocol , OData URL Conventions 
    Affects Versions: V4.0_WD01
         Environment: [Proposed]
            Reporter: Michael Pizzo
             Fix For: V4.0_WD01


In ODATA-32 we added the ability to do things like filtered expands. We also support filtering collections by type using a CAST segment, and should do the same for $expanded properties.

For example; 

    ~Employees/hr.Managers?$expand=DirectReports

today returns only those employees that are managers, and their direct reports.

    ~Employees?$expand=hr.Managers/DirectReports

today returns all employees and, for those employees that are managers, all of their direct reports.

We would also support:

    ~Employees/hr.Managers?$expand=DirectReports/hr.Managers

to return only employees that were managers, and only those direct reports that were also managers.

and

    ~Employees?$expand=hr.Managers/DirectReports/hr.Managers

to return all employees and, for each employee that was a manager, only those direct reports that were also managers.




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