clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Optimize parsing of JSON objects into shared data
- Don't read a column sample when the enumeration excludes dynamic streams
- Read the inputs of all TTL rules when a mutation recalculates TTL infos
- IN and JOIN runtime filters: a branch-free cuckoo table for set lookups cuts TPC-H SF10 Q17 time by 32%
- Speed up server shutdown by shutting down databases concurrently
- Include the storage in `s3` cache keys
- Parts with any skip index written by 26.8+ are unreadable and unmergeable on 26.6 after a rollback: `Unknown format (1) of packed data (UNKNOWN_FORMAT_VERSION)`
- Bound the `metadata-log` of Iceberg tables on write
- Revert "Fit the insert pipeline and merges into a small server's memory"
- Do not allocate from string lengths declared in a `Native` column header
- Docs
- C++ not yet supported