Hello,
I’m not sure if I understand your question. Do you mean that there is no charset attribute in the ORACLE_DATA_WRITER component, and in other bulkloader components? Do you need such attribute?
I tried to run on the command line can be successful sqlldr into unicode character set, but did not succeed oracle_data_writer into unicode character sets, I try in the source code with the charset attribute to solve this problem. Other bulkloader components I have not tried, I think it is also not such a problem?