of the window state? This is actually
an optimization for the case when `RocksDBStateBackend`
[is used](//nightlies.apache.org/flink/flink-docs-release-1.11/ops/state/state_backends.html#the-rocksdbstatebackend). Iterating over a `ListState` would cause all of the `Transaction`
objects to be deserialized. Using `MapState`\'s keys iterator only causes
deserialization of the keys (type `long`), and therefore reduces the
computational overhead.
</div>
<p>This concludes the description of the implementation det