clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- support array join in projection
- UNION ALL issue between Clickhouse table and MongoDb connected table
- Multiple ARRAY JOIN (Cartesian Product of Arrays)
- MATERIALIZE PROJECTION FINAL
- External GROUP BY memory issues (large table deduplication)
- Filter cancelled queries
- Specifying that a window function should only be computed for certain rows
- Clickhouse only able to send data single time using (kafka)
- Respect `insert_quorum` if specified in `CREATE MATERIALIZED VIEW`
- windowFunnel outputs wrong level if the event list are the same
- Docs
- C++ not yet supported