Behavior
Rounds the values from a numerical source column to the specified number of decimal places (accuracy), writes the results to the target column and overwrites any existing values there. If the target column does not exist, it is created.
If the accuracy itself is specified as a decimal number, the decimal places are ignored, i.e., the integer value is used. Values that already have the same number or fewer decimal places than specified remain unchanged.
When rounding, the value is rounded down if the next decimal place is < 5, otherwise it is rounded up.