I am trying to aggregate rows which each contain a column of Set<BIGINT>. I would like the result to contain the sum of all sets, where null would be equivalent to the empty set. I expected a query like: "select sum(my_set_column) from my_table group by my_key_column" to do this, but the set type is not supported by this aggregate. Does anyone know of a way to aggregate this using existing cassandra built-ins? Thanks!