presto-main/src/main/java/io/prestosql/operator/TableFinishOperator.java/TableFinishOperator/isStatisticsPosition
class TableFinishOperator:    private static boolean isStatisticsPosition(Page page, int position)
    {
        return page.getBlock(ROW_COUNT_CHANNEL).isNull(position) && page.getBlock(FRAGMENT_CHANNEL).isNull(position);
    }