pub unsafe extern "C" fn rocksdb_create_iterator_cf(
db: *mut rocksdb_t,
options: *const rocksdb_readoptions_t,
column_family: *mut rocksdb_column_family_handle_t,
) -> *mut rocksdb_iterator_t
pub unsafe extern "C" fn rocksdb_create_iterator_cf(
db: *mut rocksdb_t,
options: *const rocksdb_readoptions_t,
column_family: *mut rocksdb_column_family_handle_t,
) -> *mut rocksdb_iterator_t