@Override
    public String toString() {
        return "RolledUpStatisticEvent [originalStatisticEvent=" + originalStatisticEvent + ", tagListPermutations="
                + tagListPermutations + "]";
    }
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