Samenvatting
Die Diskussion über die Präaggregation in ClickHouse konzentriert sich auf die Verwendung von AggregatingMergeTree im Vergleich zu ReplacingMergeTree. AggregatingMergeTree zusammen mit materialisierten Ansichten ermöglicht schnelle Aggregationen für hochdurchsatzfähige Datenströme, während ReplacingMergeTree Idempotenz gewährleistet. Allerdings erfolgt die Duplikation nur zum Zeitpunkt des Mergings, was zu Unsicherheiten in den Ergebnissen führt.
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