clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Cleanup skips streams absent from `columns.txt`: pre-fix parts stay broken
- `f | g` composition lets `g`'s lambda args/aliases capture `f`'s free columns
- Alias named `_N` (N > 128) rejected in HOF first argument before scope check
- Show explicitly stopped/paused background actions in `system.tables`
- `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)
- Docs
- C++ not yet supported