presto-orc/src/main/java/io/prestosql/orc/writer/SliceDictionaryColumnWriter.java/DictionaryRowGroup/DictionaryRowGroup
class DictionaryRowGroup:        public DictionaryRowGroup(IntBigArray dictionaryIndexes, int valueCount, ColumnStatistics columnStatistics)
        {
            requireNonNull(dictionaryIndexes, "dictionaryIndexes is null");
            checkArgument(valueCount >= 0, "valueCount is negative");
            requireNonNull(columnStatistics, "columnStatistics is null");

            this.dictionaryIndexes = dictionaryIndexes;
            this.valueCount = valueCount;
            this.columnStatistics = columnStatistics;
        }