clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Overly cautious test in Install.cpp prevents setcap execution on CentOS 7
- system.dictionaries reports incorrect bytes_allocated for Array attributes
- How can quickly restore atomic databases/tables if metadata disk broken.
- Join Engine slower than MergeTree engine for high number of key lookups
- Add JetStream persistence support for NATS
- [RFC] Introduce `gporca` into ClickHouse for optimizing query sql
- Allow setting up prefer_fetch_merged_part_size_threshold without the time threshold
- DISTINCT tuple(a, b) doesn't use DISTINCT in order optimization
- limit 0 performance issue .
- why insert into distributed table per shard directly is slower than insert into distributed table?
- Docs
- C++ not yet supported