pub unsafe extern "C" fn rocksdb_transactiondb_flush_cfs(
    txn_db: *mut rocksdb_transactiondb_t,
    options: *const rocksdb_flushoptions_t,
    column_families: *mut *mut rocksdb_column_family_handle_t,
    num_column_families: c_int,
    errptr: *mut *mut c_char
)