presto-spi/src/main/java/io/prestosql/spi/statistics/ComputedStatistics.java/Builder/Builder
class Builder:        private Builder(List<String> groupingColumns, List<Block> groupingValues)
        {
            this.groupingColumns = requireNonNull(groupingColumns, "groupingColumns is null");
            this.groupingValues = requireNonNull(groupingValues, "groupingValues is null");
        }