presto-orc/src/main/java/io/prestosql/orc/metadata/statistics/StringStatistics.java/StringStatistics/getRetainedSizeInBytes
class StringStatistics:    @Override
    public long getRetainedSizeInBytes()
    {
        return INSTANCE_SIZE + (minimum == null ? 0 : minimum.getRetainedSize()) + ((maximum == null || maximum == minimum) ? 0 : maximum.getRetainedSize());
    }