presto-spi/src/main/java/io/prestosql/spi/statistics/ColumnStatisticMetadata.java/ColumnStatisticMetadata/toString
class ColumnStatisticMetadata:    @Override
    public String toString()
    {
        return "ColumnStatisticMetadata{" +
                "columnName='" + columnName + '\'' +
                ", statisticType=" + statisticType +
                '}';
    }