presto-main/src/main/java/io/prestosql/sql/planner/plan/StatisticAggregationsDescriptor.java/StatisticAggregationsDescriptor/empty
class StatisticAggregationsDescriptor:    public static <T> StatisticAggregationsDescriptor<T> empty()
    {
        return StatisticAggregationsDescriptor.<T>builder().build();
    }