Technique 2: Variable-window iterative scanningThe bucketed schema solved the "reading too much data per row" problem. But we still had the "scanning too many rows" problem — and crucially, the deduplication cost that comes with it. Because every row scanned has to be grouped and deduplicated before results can be returned, reducing the scan range doesn't just mean less I/O — it means a dramatically smaller deduplication surface. A GROUP BY ... LIMIT 25 over 30 minutes of data is a fundamentally different operation than the same query over 30 days.
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