OptionalthrowError: booleanProtected ReadonlydistinctProtected ReadonlyevaluatorProtected ReadonlysuperProtected ReadonlytermProtected ReadonlyvariableThe spec says to throw an error when a set function is called on an empty set (unless explicitly mentioned otherwise like COUNT). However, aggregate error handling says to not bind the result in case of an error. So to simplify logic in the caller, we return undefined by default.
Protectedterm
This is the base class for all aggregators. NOTE: The wildcard count aggregator significantly differs from the others and overloads parts of this class.