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Stream<Event> -> Stream<WindowedBatch<Event>>
Group continuous, unbounded streams of timestamped events into discrete time-based chunks (tumbling, hopping, or session windows) using watermark-based progression.
Problem it solves
Unbounded streams cannot be grouped or aggregated natively in relational databases without artificial time boundaries.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.