clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `apply_deleted_mask = 0` + on-fly lightweight `DELETE` empties vector search
- Fix /metrics returning HTTP 500 when the scrape has no User-Agent header
- 3 more passes rewrite a `group_by_use_nulls` key but not its `Nullable` copy
- SummingMergeTree FINAL sums `...Map` wrong depending on column read order
- `-OrNull`/`-OrDefault` version forward not gated like `-Merge`: `UNKNOWN_CODEC`
- Partition min/max wrong after insert-time merge (optimize_on_insert=1)
- Accept any date-time format parseDateTimeBestEffort understands in Prometheus time parameters
- FR: EXECUTE AS ... CONST_SETTINGS`: enforce locked settings applied when impersonating a user
- BigQuery is slow
- Grid `contains` maps points past the bbox max side into `inner` cells
- Docs
- C++ not yet supported