pub unsafe extern "C" fn rocksdb_delete_range_cf(
db: *mut rocksdb_t,
options: *const rocksdb_writeoptions_t,
column_family: *mut rocksdb_column_family_handle_t,
start_key: *const c_char,
start_key_len: usize,
end_key: *const c_char,
end_key_len: usize,
errptr: *mut *mut c_char,
)