presto-main/src/main/java/io/prestosql/type/DecimalOperators.java/DecimalOperators/subtractShortShortShort
class DecimalOperators:    @UsedByGeneratedCode
    public static long subtractShortShortShort(long a, long b, long aRescale, long bRescale)
    {
        return a * aRescale - b * bRescale;
    }