presto-main/src/main/java/io/prestosql/sql/planner/StatisticsAggregationPlanner.java/StatisticsAggregationPlanner/TableStatisticAggregation
class StatisticsAggregationPlanner:        private TableStatisticAggregation(
                StatisticAggregations aggregations,
                StatisticAggregationsDescriptor<Symbol> descriptor)
        {
            this.aggregations = requireNonNull(aggregations, "statisticAggregations is null");
            this.descriptor = requireNonNull(descriptor, "descriptor is null");
        }