private boolean isPrefixKey(byte[] targetKeyBytes, byte[] keyBytes) {
    for (int i = 0; i < keyBytes.length; i++) {
      if (targetKeyBytes[i] != keyBytes[i]) {
        return false;
      }
    }
    return true;
  }
Retrieve the elements of the key.

<p>Fetch the Collection from guava cache, if not present, fetch from rocksDB continuously, via
prefix key scanning the rocksDB; if present, just return the result.

@return not null, but may be empty.
amoro-format-mixed/amoro-mixed-flink/amoro-mixed-flink-common/src/main/java/org/apache/amoro/flink/lookup/RocksDBSetState.java