The solicitor of the thirteenth judicial circuit may appoint an attorney who is a resident of Greenville County as his full-time assistant who shall perform any of the duties and functions imposed by law upon the circuit solicitor relating to Greenville County. The term of the assistant solicitor shall be coterminous with that of the solicitor and he shall receive such compensation as may be provided by the county council for Greenville County. The compensation of the assistant solicitor and any other expenses incurred pursuant to the provisions of this section shall be borne by Greenville County.