clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- parseDateTime allocates an error-message string for every parsed field, also on valid input
- Fix `addDays` and other date add functions throwing on rows rejected by a short-circuit condition
- Look up the keys of small `IN` sets in a branch-free cuckoo table
- Optimize parsing of JSON objects into shared data
- Don't read a column sample when the enumeration excludes dynamic streams
- 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
- 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
- ClickHouse Iceberg Catalog: Support stage-create
- Docs
- C++ not yet supported