presto-orc/src/main/java/io/prestosql/orc/metadata/statistics/BinaryStatisticsBuilder.java/BinaryStatisticsBuilder/addValue
class BinaryStatisticsBuilder:    @Override
    public void addValue(Slice value)
    {
        requireNonNull(value, "value is null");

        sum += value.length();
        nonNullValueCount++;
    }