presto-tpcds/src/main/java/io/prestosql/plugin/tpcds/statistics/TpcdsTableStatisticsFactory.java/TpcdsTableStatisticsFactory/toColumnStatistics
class TpcdsTableStatisticsFactory:    private ColumnStatistics toColumnStatistics(ColumnStatisticsData columnStatisticsData, Type type, long rowCount)
    {
        ColumnStatistics.Builder columnStatistics = ColumnStatistics.builder();
        long nullCount = columnStatisticsData.getNullsCount();
        columnStatistics.setNullsFraction(Estimate.of((double) nullCount / rowCount));
        columnStatistics.setRange(toRange(columnStatisticsData.getMin(), columnStatisticsData.getMax(), type));
        columnStatistics.setDistinctValuesCount(Estimate.of(columnStatisticsData.getDistinctValuesCount()));
        columnStatistics.setDataSize(columnStatisticsData.getDataSize().map(Estimate::of).orElse(Estimate.unknown()));
        return columnStatistics.build();
    }