@Override
    public String toString() {
        return "SQLStatValSourceDO{" +
                "createMs=" + createMs +
                ", name='" + name + '\'' +
                ", valueSum=" + valueSum +
                ", count=" + count +
                ", type=" + type +
                '}';
    }
@return The count aggregate for a COUNT stat, or the count of stat
events for a VALUE stat.
stroom-statistics/stroom-statistics-impl-sql/src/main/java/stroom/statistics/impl/sql/SQLStatValSourceDO.java