clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 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
- Normalize a unary sign before a number in normalizeQuery and normalizedQueryHash
- Fix wrong results of `pointInPolygon` for points next to an edge with a distant vertex
- Fix crash when a lambda or SQL UDF with an aggregate function is called with a GROUP BY key under `group_by_use_nulls`
- Docs
- C++ not yet supported