clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix a web terminal query that failed on the client side staying in `system.processes`
- Stop the other S3 reads of a failed merge or mutation
- Preserve systemd service state during Debian package upgrades
- Fix column arena serialization on big endian platforms to consistently read and write little endian format data
- MarkCache: the global mutex is held for seconds during a hash-table rehash, stalling every query on the host
- `FINAL` with a skip index reads the whole part when the sorting key is descending (`allow_experimental_reverse_key`)
- Move throws out of hot loops; vectorize float-to-int `CAST` and `GCD
- Fix a `set` skip index dropping matching granules for a derived `indexHint` over an alias named like a column
- LocalConnection::sendCancel ignores partial_result_on_first_cancel
- Same trigger over TCP: client waits `receive_timeout` for a 2nd `EndOfStream`
- Docs
- C++ not yet supported