presto-orc/src/main/java/io/prestosql/orc/metadata/OrcMetadataReader.java/OrcMetadataReader/toStringStatistics
class OrcMetadataReader:    static StringStatistics toStringStatistics(HiveWriterVersion hiveWriterVersion, OrcProto.StringStatistics stringStatistics, boolean isRowGroup)
    {
        if (hiveWriterVersion == ORIGINAL && !isRowGroup) {
            return null;
        }

        Slice maximum = stringStatistics.hasMaximum() ? maxStringTruncateToValidRange(byteStringToSlice(stringStatistics.getMaximumBytes()), hiveWriterVersion) : null;
        Slice minimum = stringStatistics.hasMinimum() ? minStringTruncateToValidRange(byteStringToSlice(stringStatistics.getMinimumBytes()), hiveWriterVersion) : null;
        long sum = stringStatistics.hasSum() ? stringStatistics.getSum() : 0;
        return new StringStatistics(minimum, maximum, sum);
    }