clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Poor query optimization when using views and join
- Ideas for performance optimizations of aggregation in order
- Add table function `obfuscate`
- Less reads for read-in-order optimization.
- Subtle differences in table definition between nodes may cause errors during aggregation
- The clickhouse server can not be connected， and there are a lot of CLOSE_WAIT connections
- DateTime64 1901 in Guam should not be 1900
- No progress report when projection and filter columns are different
- Converting scientific notation to float64 returns imprecise value
- after change storage policy from cold_disk to s3, weird merge
- Docs
- C++ not yet supported