Version : 4.3.5 build 6242

Query:

      var query = Query.All<MyEntity>()
        .Select(e => new 
          {
            MyEntity = e,
            Year = (int?)e.Date.Value.Year,
            Status = e.Infos.OfType<SuccessInfo>().Any() ? Status.Success : (e.Infos.OfType<ErrorInfo>().Any() ? Status.Error : Status.Unknown)
          })
        .Select(o => new object[] { o.MyEntity.Id, o.Year, o.Status });

Exception:

System.InvalidCastException was unhandled
  Message=Specified cast is not valid.
  Source=Xtensive.Core
  StackTrace:
       at Xtensive.Core.Tuples.Tuple.GetValueOrDefaultInternal[T](Boolean isNullable, Int32 fieldIndex)
       at Xtensive.Core.Tuples.Tuple.GetValueOrDefault[T](Int32 fieldIndex)
       at lambda_method(Closure , Object[] , Tuple , ItemMaterializationContext )
       at Xtensive.Core.DelegateBindExtensions.<>c__DisplayClassa`4.<Bind>b__9(T2 arg2, T3 arg3)
       at Xtensive.Storage.Linq.Materialization.MaterializationHelper.<>c__DisplayClass4`1.<Materialize>b__3(Tuple tuple)
       at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
       at Xtensive.Core.EnumerableExtensions.<Batch>d__20`1.MoveNext()
       at Xtensive.Core.EnumerableExtensions.<ApplyBeforeAndAfter>d__28`1.MoveNext()
       at Xtensive.Storage.TransactionalExtensions.<ToTransactional>d__0`1.MoveNext()
       at System.Linq.Enumerable.<SelectManyIterator>d__14`2.MoveNext()
       at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
       at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)

Test project :

http://olorin.dinauz.org/temp/TestMaterializationBug.zip

The really strange thing is that the same query works if I change the order of selected columns...