clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 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
- Concurrency-aware max_threads when it is auto: narrow the query plan when many queries compete for CPU
- Password prompt should display each typed character as `●` or `*`
- Keep the definition from the backup when restoring a `MySQL` table or database
- `normalizeDivision` misses `APPLY` lambdas, row-policy and additional filters
- MySQL dictionary `EXPRESSION v / 2` stored as `divideExact`: load fails
- Docs
- C++ not yet supported