pub unsafe extern "C" fn rocksdb_transaction_create_iterator_cf(
txn: *mut rocksdb_transaction_t,
options: *const rocksdb_readoptions_t,
column_family: *mut rocksdb_column_family_handle_t
) -> *mut rocksdb_iterator_t
pub unsafe extern "C" fn rocksdb_transaction_create_iterator_cf(
txn: *mut rocksdb_transaction_t,
options: *const rocksdb_readoptions_t,
column_family: *mut rocksdb_column_family_handle_t
) -> *mut rocksdb_iterator_t