Method round

core/src/main/java/io/questdb/std/Decimal128.java:1077–1112

Round this Decimal128 to the specified scale using the given rounding mode. This method performs in-place rounding without requiring a divisor. @param targetScale the desired scale (number of decimal places) @param roundingMode the rounding mode to use @throws NumericException if targetScale is in

(int targetScale, RoundingMode roundingMode)

     * @throws NumericException if roundingMode is UNNECESSARY and rounding is required
     */
    public void round(int targetScale, RoundingMode roundingMode) {
        if (isNull()) {
            return;
        }

        if (targetScale == this.scale) {
            // No rounding needed
            return;
        }

        validateScale(targetScale);

        if (isZero()) {
            this.scale = targetScale;
            return;
        }

        if (this.scale < targetScale) {
            boolean isNegative = isNegative();
            if (isNegative) {
                negate();
            }

            // Need to increase scale (add trailing zeros)
            int scaleIncrease = targetScale - this.scale;
            multiplyByPowerOf10InPlace(scaleIncrease);
            this.scale = targetScale;

            if (isNegative) {
                negate();
            }
            return;
        }

        divide(0, 1, 0, targetScale, roundingMode);
    }

    /**
     * Set the scale forcefully without doing any rescaling operations