clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- multiple tables join missing column "123456"
- remove table shard node if it is empty when use remote disk and zero copy feature.
- replica can drop data before cloning during `move partition`
- GROUPING SETS + grouping + if(grouping(key) = 1, uniqExact(column),0) optimization
- Poco remove old logs and create empty log files when out of disk space
- Provide atomic guarantees for EXCHANGE operation with multiple tables on Atomic DB Engine
- OrDefault combinator fails when condition is all NULLs
- GROUP BY clause SQL standard compatibility
- External PostgreSQL dictionary with layout COMPLEX_KEY_DIRECT does not use filtering by primary key
- Setting aggregation_memory_efficient_merge_threads value dynamically
- Docs
- C++ not yet supported