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a3a764fd10
Fixes #5669 This implements non-atomic collection and UDT handling for both cdc preimage + delta. To be able to express deltas in a meaningful way (and reconstruct using it), non-atomic values are represented somewhat differently from regular values: * maps - stored as is (frozen) * sets - stored as is (frozen) * lists - stored as map<timeuuid, value> (frozen) this allows reconstructing the list, as otherwise things like list[0] = value cannot be represented in a meaningful way * udt - stored as tuple<tuple<field0>, tuple<field1>...> (frozen) UDTs are normally just tuples + metadata, but we need to distinguish the case of outer tuple element == null, meaning "no info/does not partake in mutation" from tuple element being a tuple(null) (i.e. empty tuple), meaning "set field to null"