clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- In-line FINAL vs. final=1 yield different SelectedBytes for Distributed ReplicatedAggregatingMergeTree Tables
- ifNull/coalesce identity wrapper nested inside a key expression defeats partition pruning (e.g. sipHash64(ifNull(p,0)))
- Native protocol: send String columns with a size stream
- Wrong query result on master — optimization bypass divergence [0372f5d0324a9f04]
- Wrong query result on master — settings randomization divergence [2b0dd05393c693c7]
- DataLakeCatalog / Unity Catalog over GCS: unreadable — vended creds don't parse GCP tokens, static-key fallback not in any release
- Userspace dynamic loader (dlopen for statically linked binaries)
- Filter above INTERSECT/EXCEPT is not pushed into the input branches (UNION is)
- Avoid empty SETTINGS in NATS table metadata
- Segmentation fault in RemoteQueryExecutorReadContext async fiber resume during shutdown/timeout (STID: 4348-2010)
- Docs
- C++ not yet supported