Function mdb_sql_add_temp_col 

pub unsafe extern "C" fn mdb_sql_add_temp_col(
    sql: *mut MdbSQL,
    ttable: *mut MdbTableDef,
    col_num: c_int,
    name: *mut c_char,
    col_type: c_int,
    col_size: c_int,
    is_fixed: c_int,
) -> c_int