Test Aggregate_over_subquery_in_group_by_projection is non-deterministic

[roji]

var query = context
    .Set<Order>()
    .Where(someFilterFromOutside)
    .GroupBy(x => new { x.CustomerId, x.Number })
    .Select(x => new
    {
        x.Key.CustomerId,
        CustomerMinHourlyRate = context.Set<Order>().Where(n => n.CustomerId == x.Key.CustomerId).Min(h => h.HourlyRate),
        HourlyRate = x.Min(f => f.HourlyRate),
        Count = x.Count()
    });

The order of the groupings isn't defined, so this fails on PG.