Method hasCarry

core/src/main/java/io/questdb/std/Decimal256.java:668–672

Check if addition resulted in a carry When adding two unsigned numbers a + b = sum, carry occurs iff sum < a (or sum < b) This works because: - No carry: sum = a + b, so sum >= a and sum >= b - Carry: sum = a + b - 2^64, so sum < a and sum < b

(long a, long sum)

     * - Carry: sum = a + b - 2^64, so sum < a and sum < b
     */
    public static boolean hasCarry(long a, long sum) {
        // We can check against either a or b - both work
        // Using a for consistency, b parameter kept for clarity
        return (sum + Long.MIN_VALUE) < (a + Long.MIN_VALUE);
    }

    /**
     * Returns whether the Decimal256 is null or not.