clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- fix(promql) `or` chains that exceed the query tree limit are not duplicated anymore.
- Honor read limits for file, URL and object-storage sources
- Fix key analysis skipping rows for wrapping `toDate` keys and date-time text in tuple constants
- Bound the local-task chain of a single-threaded executor while an async task is waiting
- Performance regression: primary-key analysis of a bare UInt8 filter (`WHERE flag`) grows with the number of marks on 26.8 (index_granularity = 8192)
- Refuse attach of MaterializedPostgreSQL when resuming would lose changes
- Fix a crash on INSERT when a materialized view reads its source table through `merge`, `loop` or `executable`
- Unified mechanism for TTL delete and lightweight delete in vertical merges
- Choose the effective `max_threads` once per query
- Open-loop mode with Poisson arrivals in clickhouse-benchmark
- Docs
- C++ not yet supported