CounterID	UInt32		
StartDate	Date		
UserID	UInt32		
VisitID	UInt32		
NestedColumn.A	Array(UInt8)		
NestedColumn.S	Array(String)		
ToDrop	UInt32		
Added0	UInt32		
Added1	UInt32		
Added2	UInt32		
AddedNested1.A	Array(UInt32)		
AddedNested1.B	Array(UInt64)		
AddedNested1.C	Array(String)		
AddedNested2.A	Array(UInt32)		
AddedNested2.B	Array(UInt64)