clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix cancelation of mutation task after `KILL MUTATION`
- Auto-enable uncompressed cache for MergeTree reads
- Add replacing_merge_cleanup_period_seconds experimental setting for ReplacingMergeTree
- perf: Prune parts for `ORDER BY LIMIT` queries on partitioned tables when `optimize_read_in_order=1`
- Use blocked Bloom filter for join runtime filters
- Introduce MergeTree Queue Engine
- limit after
- Add `GradualResizeProcessor` to limit effective parallelism for GROUP BY on small data volumes
- [CI crash] Exception during pipeline execution
- Add query plan cache for SELECT queries
- Docs
- C++ not yet supported