public class T1 {
	public long Id { get; set; }
	public long? T2Id { get; set; }
	public T2 T2 { get; set; }
}

public class T2 {
	public long Id { get; set; }
	public string Name { get; set; }
}

var q = 
from t in db.T1
select new {
	t.Id,
	t.T2.Name
};
var res = q.ToLinqToDB().TablesInScopeHint(SqlServerHints.Table.NoLock).ToList();

SELECT
	[t].[Id],
	[t_T2].[Name]
FROM
	[dbo].[T1] [t] WITH (NoLock)
		LEFT JOIN [dbo].[T2] [t_T2] ON [t].[T2Id] = [t_T2].[Id]

SELECT
	[t].[Id],
	[t_T2].[Name]
FROM
	[dbo].[T1] [t] WITH (NoLock)
		LEFT JOIN [dbo].[T2] [t_T2] WITH (NoLock) ON [t].[T2Id] = [t_T2].[Id]