presto-spi/src/main/java/io/prestosql/spi/statistics/ColumnStatistics.java/ColumnStatistics/toString
class ColumnStatistics:    @Override
    public String toString()
    {
        return "ColumnStatistics{" +
                "nullsFraction=" + nullsFraction +
                ", distinctValuesCount=" + distinctValuesCount +
                ", dataSize=" + dataSize +
                ", range=" + range +
                '}';
    }