presto-spi/src/main/java/io/prestosql/spi/statistics/ColumnStatisticMetadata.java/ColumnStatisticMetadata/equals
class ColumnStatisticMetadata:    @Override
    public boolean equals(Object o)
    {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        ColumnStatisticMetadata that = (ColumnStatisticMetadata) o;
        return Objects.equals(columnName, that.columnName) &&
                statisticType == that.statisticType;
    }