presto-spi/src/main/java/io/prestosql/spi/type/UnscaledDecimal128Arithmetic.java/UnscaledDecimal128Arithmetic/shiftLeft
class UnscaledDecimal128Arithmetic:    static Slice shiftLeft(Slice decimal, int leftShifts)
    {
        Slice result = Slices.copyOf(decimal);
        shiftLeftDestructive(result, leftShifts);
        return result;
    }