clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Run automatic parallel replicas last and give parallel replicas the `GROUP BY` top-K heap
- TopK alias resolution maps a redefined subquery column onto the raw column
- Scale of toDecimal*/toDateTime64/toTime64 and precision of DateTime64(N)/Time64(N) are truncated to UInt32 before the range check: CREATE TABLE with DateTime64(4294967299) makes a DateTime64(3) column
- Follow-ups to the review of the `obfuscate` table function
- Do not merge `WITH ROLLUP` input blocks that cannot combine, and emit each grouping set as one block
- Skip granules for `GROUP BY` with `max`/`min` of a sorting key column using the primary index
- `parkLease` never lowers `requested_ns`; competing workloads starve for seconds
- Reject a `DateTime64`/`Time64` precision or a decimal scale above 4294967295 instead of taking it modulo 2^32
- `resetOutput` finalizes JSON over a canceled buffer: `LOGICAL_ERROR`
- fix(promql): Cancel Prometheus query API requests when the client disconnects
- Docs
- C++ not yet supported