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Take a look to Yandex ClickHouse, this is open-source append-only analytical database. It offers ultimate performance of OLAP queries and data like events log,
by seektable 9y ago
Take a look to Yandex ClickHouse, this is open-source append-only analytical database. It offers ultimate performance of OLAP queries and data like events log, and its SQL dialect includes a lot of specialized functions for metrics calculation.