@Override
            public boolean hasNext() {
                if (tagListPermutations == null || tagListPermutations.size() == 0) {
                    return false;
                }

                return nextElement < tagListPermutations.size();
            }
To be used when no roll ups are required
stroom-statistics/stroom-statistics-impl-sql/src/main/java/stroom/statistics/impl/sql/rollup/RolledUpStatisticEvent.java