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UpsertBatch -> UpdatedStorageState
Resolve upserts and deletes on columnar storage in real-time by checking mutations against an in-memory primary key directory.
Problem it solves
Columnar structures are append-friendly but highly inefficient when handling real-time point updates.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.