presto-orc/src/main/java/io/prestosql/orc/OrcWriteValidation.java/StatisticsValidation/addPage
class StatisticsValidation:        public void addPage(Page page)
        {
            rowCount += page.getPositionCount();
            for (int channel = 0; channel < columnStatisticsValidations.size(); channel++) {
                columnStatisticsValidations.get(channel).addBlock(page.getBlock(channel));
            }
        }