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