clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- OPTIMIZE MANIFEST refused when snapshot summary omits total-records
- Sorted `LIMIT BY` dedups `-0.0` and `0.0` by comparison while the hash path is bitwise: adding `ORDER BY` silently drops or fabricates rows
- Show the result in `Pretty` formats as soon as it arrives
- __topKFilter dispatch misses Nullable inside Tuple: Nullable(UInt8) prewhere
- `KeyCondition::checkInHyperrectangle` applies the same monotonic chain once per condition atom, recomputing an identical transformed `Range` on every granule
- Fix text-search functions ignoring the text index tokenizer above a JOIN
- Fix remote query executor cancel hang
- Incorrect results: Light weight updates can give wrong results when block number turned off and on.
- Support quotas over any profile event
- Do not refuse a manifest-only Iceberg rewrite over an absent parent total
- Docs
- C++ not yet supported