/// <summary>
/// Saves the state of the specified stateful operator using a writer obtained from the specified state writer factory.
/// </summary>
/// <param name="factory">Factory to create an operator state writer to write operator state to.</param>
/// <param name="node">Operator whose state to write.</param>
public static void SaveState(this IOperatorStateWriterFactory factory, IStatefulOperator node)
{
using var writer = factory.Create(node);
SaveState(writer, node);
}
public IOperatorStateWriter CreateChild() => _factory.Create(node: null);
