Eager loading seems to not work with recursive CTEs?

Is it possible to use .Include/.ThenInclude, aka eager loading, for recursive CTEs? It seems that applying them on the query does absolutely nothing. Is it intended?

[sdanyliv]

Why not 😉 If you start thinking from SQL query but not from object collections perspective - it is natural way. And surprise, you will get almost the same SQL as a LINQ query.

[sdanyliv]

I have corrected your query and it should work. Currently recursive CTE cannot return whole object but only projection.

class DivisionCte
{
    public int DivisionId;
    public int ParentId;
}

var divisionCte = _context.GetCte<DivisionCte>(d => 
    (
        from div in _context.Divisions
        where div.DivisionId == divId
        select new DivisionCte
        { 
            DivisionId = div.DivisionId
            ParentId = div.ParentId
        }
    )
    .Concat
    (
        from cdiv in _context.Divisions
        join pdiv in d on cdiv.ParentId equals pdiv.DivisionId
        select new DivisionCte
        {
            DivisionId = cdiv.DivisionId,
            ParentId = cdiv.ParentId
        }
    ));

var query = 
    from d in _context.Divisions.Include(d => d.Employees)
    join cte in divisionCte on d.DivisionId equals cte.DivisionId
    select d;

var result = await query.ToArrayAsyncLinqToDB();