presto-main/src/main/java/io/prestosql/operator/scalar/StringFunctions.java/StringFunctions/charLength
class StringFunctions:    @Description("count of code points of the given string")
    @ScalarFunction("length")
    @LiteralParameters("x")
    @SqlType(StandardTypes.BIGINT)
    public static long charLength(@LiteralParameter("x") long x, @SqlType("char(x)") Slice slice)
    {
        return x;
    }