presto-main/src/main/java/io/prestosql/type/DecimalOperators.java/DecimalOperators/subtractShortLongLong
class DecimalOperators:    @UsedByGeneratedCode
    public static Slice subtractShortLongLong(long a, Slice b, int rescale, boolean left)
    {
        return internalSubtractLongLongLong(unscaledDecimal(a), b, rescale, left);
    }