clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `isNumber(removeNullable(type))` in `PrettyBlockOutputFormat` does not strip `LowCardinality`, so `LowCardinality(numeric)` columns skip digit-group highlighting while plain or `Nullable` numeric columns are highlighted
- `trivial_limit = 1 + max_rows` triggers `TOO_MANY_ROWS` for boundary case `LIMIT N` with `max_rows_to_read = N`
- librdkafka fork missing `ERR__DESTROY` guard in `rd_kafka_handle_SaslAuthenticate` — spurious SASL errors on Kafka engine producer destroy
- 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)
- `canConvertTo<size_t>` returns true for `x = 2^64` because `Float64(SIZE_MAX)` rounds up to `2^64`; subsequent `static_cast<size_t>` is UB
- Add per-object trace logs to object storage cluster sources
- Fix SELECT error with unmerged patch parts when lazy materialization …
- Download file in `CSVWithNames` format with `.csv` extension from `play.html`
- When a table has no ORDER BY key, we should use `optimize_row_order` by default
- Docs
- C++ not yet supported