presto-orc/src/main/java/io/prestosql/orc/metadata/RowGroupIndex.java/RowGroupIndex/RowGroupIndex
class RowGroupIndex:    public RowGroupIndex(List<Integer> positions, ColumnStatistics statistics)
    {
        this.positions = ImmutableList.copyOf(requireNonNull(positions, "positions is null"));
        this.statistics = requireNonNull(statistics, "statistics is null");
    }