An unbounded, ordered sequence of events — each with a key, value, and timestamp.
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Fixed-size, non-overlapping windows — every event belongs to exactly one window.
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Fixed-size, overlapping windows — one event may appear in multiple windows.
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Dynamic-size windows bounded by inactivity gaps — no fixed size, driven by activity bursts.
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Joining two streams on a matching key within a time window — each pair of matching events produces one joined output record.