id [] [] [] t ['a','s'] ['UInt64','String'] ['Sparse','Default'] (0,'a') (0,'aa') (0,'aaa') (0,'aaaa') (0,'aaaaa') (20,'a') (40,'a') (60,'a') (80,'a') (100,'a') (20,'a') (40,'a') (60,'a') (80,'a') (100,'a') 0 0 0 0 0 20 40 60 80 100 20 40 60 80 100 a aa aaa aaaa aaaaa a a a a a id [] [] [] t ['a','b','b.u','b.s'] ['UInt64','Tuple(u UInt32, s String)','UInt32','String'] ['Sparse','Default','Sparse','Default'] 0 0 0 60 0 a aa aaa aaaa aaaaa aaaaaa a aaaaaa a aaaaaa id [] [] [] t ['a','b','b.u','b.s'] ['UInt64','Tuple(u UInt32, s String)','UInt32','String'] ['Sparse','Default','Sparse','Default'] aaaaaa a aaaaaa a aaaaaa