clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Support the standard GROUP BY set quantifier: GROUP BY DISTINCT (feature T434)
- Do not require `ALTER DELETE` for `ATTACH PARTITION FROM` and `CLONE AS`
- A `JSONAllPaths` skip index silently prunes all granules for a subcolumn under a typed `JSON` path with substructure
- Extend reading in reverse order with FINAL to Merge tables and topK through JOIN
- Read-in-order optimization returns wrong order (wrong rows under LIMIT) for a monotonically decreasing function of a Float sorting key containing nan
- Read-in-order before projections kills projection-index filtering of the base read
- Size header charged against a 16-byte read window: ssd_cache disk reads throw
- Keeper: put deserialized values in log_entry instead of a separate cache
- MemoryTracking grows continuously and is never released
- TTL widening applies to source columns only: toStartOfDay/toMonday re-narrow and still drop rows
- Docs
- C++ not yet supported