clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `getClientHTTPHeader` leaks HTTP Basic Auth credentials because filter checks `"authentication"` instead of `"authorization"`
- Add shared scan optimization for self-joins
- Add test: `Merge` engine over `MergeTree` with lightweight DELETE -- trivial count gating untested
- Add test: INSERT / TRUNCATE rejection on S3 archive syntax untested
- librdkafka fork missing `ERR__DESTROY` guard in `rd_kafka_handle_SaslAuthenticate` — spurious SASL errors on Kafka engine producer destroy
- PREWHERE and(LowCardinality(UInt8), UInt8, UInt8) silently returns 0 rows when IN is used on LowCardinality(String)
- Add test: `dateTrunc` 3-argument timezone form for `millisecond`/`microsecond`/`nanosecond` is untested; output `DataTypeDateTime64` scale (3/6/9) is also not asserted via `toTypeName`
- implement generate date array
- `openCgroupv2MetricFile` builds invalid file paths via string concat without separator, silently disabling all `CGroup*` metrics for nested cgroups (e.g. systemd setups)
- Add test: `ToShortest` fallback in `formatReadable` is reachable but untested across the suite
- Docs
- C++ not yet supported