df.sortBy { age }

Input DataFrame: rowsCount = 7, columnsCount = 5

Output DataFrame: rowsCount = 7, columnsCount = 5

df.sortBy { age and name.firstName.desc() }

Input DataFrame: rowsCount = 7, columnsCount = 5

Output DataFrame: rowsCount = 7, columnsCount = 5

df.sortBy { weight.nullsLast() }

Input DataFrame: rowsCount = 7, columnsCount = 5

Output DataFrame: rowsCount = 7, columnsCount = 5