clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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Help out
- Issues
- Support PromQL count_values
- Support PromQL absent functions
- Align PromQL scalar, timestamp, and clamp lowering
- `groupConcat` skips delimiters when leading elements are empty strings due to `data_size != 0` check
- Validate PromQL selector regex matchers
- Cover PromQL special values in binary operators
- Enable query condition cache for `ORDER BY ... LIMIT n` queries
- Add test: `TimeSeriesColumnsValidator` column type error paths untested
- Speed up the analyzer / planner for SELECT count() and similar lightweight queries
- Add a new system table `user_query_log`
- Docs
- C++ not yet supported