Async odata endpoint not returning edm model

[andrew-vdb]

Actual:
The setup use EDM model,
when we use IQueryable, the db call will be done synchronously and return EDM model
when we use IAsyncEnumerable, the db call will be done async and return simple model..
Expected:
when we use IAsyncEnumerable, the db call will be done async and should return EDM model..

//This return EDM model
[HttpGet("odata/students")]
        [EnableQuery]
        public IQueryable<Model.Student> OData()
        {
            return _context.Students;
        }

//This NOT return EDM model
        [HttpGet("odata/students")]
        [EnableQuery]
        public IAsyncEnumerable<Model.Student> OData()
        {
            return _context.Students.AsAsyncEnumerable();
        }

[andrew-vdb]

This is not supported

[HttpGet("odata/students")]
        [EnableQuery]
        public IAsyncQueryable<Model.Student> OData()
        {
            return _context.Students.AsAsyncEnumerable().AsAsyncQueryable();
        }

[xuzhg]

Could be similar to OData/WebApi#2598

[andrew-vdb]

Just tested with EnableQueryAsync in another issue...

https://localhost:7040/odata/students?$count=true&$top=2

The select top will run async
The select count will run sync
and it will return edm data as expected

[jr01]

See this issue for count async in [EnableQueryAsync] OData/WebApi#2325