Am I allowed to have “incomplete” aggregates in DDD?

Question

DDD states that you should only ever access entities through their aggregate root. So say for instance that you have an aggregate root X which potentially has a lot of

Answer 1

Jimmy Nilsson hints in his book that instead of reading a complete aggregate you can read a snapshot of parts of it. But you are not supposed to be able to save changes in the snapshot classes to the database.

Jimmy Nilsson's book Chapter 6: Preparing for infrastructure - Querying. Page 226.

Snapshot pattern