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DeltaRowData -> MaterializedAggregate
Track newly inserted or updated data regions and calculate aggregate updates periodically in the background, combining them with existing materialized summaries.
Problem it solves
Recalculating global aggregates on massive datasets on demand is slow, but rebuilding entire materialized views on every write is too expensive.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.