[Test]
public void Test([IncludeDataSources(
	ProviderName.SqlCe, ProviderName.SqlServer2012, ProviderName.SqlServer2014)] string context)
{
	using (var db = GetDataContext(context))
	{
		var query =
			from p in db.Parent
			from c in db.Child.Take(1).DefaultIfEmpty()
			select new
			{
				a = p.ParentID == 1 ? c != null ? "1" : "2" : "3"
			};

		_ = query.ToList();
	}
}