clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add Shards profile event
- Fix negative scaling for short queries with aggregation
- Fix Block structure mismatch with normal projections and parallel replicas
- Fix race condition in `IPartitionStrategy::computePartitionKey` (used by object storage sinks)
- Add compiler and linker flags for section-based optimizations
- Keeper: fix race between read requests and session close
- Fix DiskAccessStorage crash on restart when .sql file is missing
- Add `GradualResizeProcessor` to limit effective parallelism for GROUP BY on small data volumes
- Fix heap-use-after-free in MergeTreeReadTask::createReaders
- Faster base58 operations for 32/64 decoded strings
- Docs
- C++ not yet supported