presto-main/src/main/java/io/prestosql/operator/scalar/StringFunctions.java/StringFunctions/castCharToCodePoints
class StringFunctions:    @ScalarOperator(OperatorType.CAST)
    @SqlType(CodePointsType.NAME)
    @LiteralParameters("x")
    public static int[] castCharToCodePoints(@LiteralParameter("x") Long charLength, @SqlType("char(x)") Slice slice)
    {
        return castToCodePoints(padSpaces(slice, charLength.intValue()));
    }