In source file(CUBRIDSchemaProvider.cs) it use this sql to find view:
select class_name from db_class where is_system_class='NO' and [class_type='VCLASS'] and class_name LIKE 'view';
1.in system tale:class_name, it use '1' to means that it's type is view not use 'VCLASS', So the view can't be found out. So when select view the sql should has ['class_type=1']
2.system table has no table db_class but _db_class.
3.is_system_class's datatype is integer.