Major Description
There are two new system keyspaces introduced for optimizer statistics — system:dictionary and system:dictionary_cache. The difference between the two is that system:dictionary corresponds to the on-disk documents stored in N1QL_SYSTEM_BUCKET.N1QL_SYSTEM_SCOPE.N1QL_CBO_STATS, while system:dictionary_cache corresponds to the in-memory cached representation of a subset of the same information.