clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- When joining more than two tables on LEFT JOIN, system loses first column simple name and appends database name to the column
- incorrect results for uniq(UUID type)
- CSV output strings without double quotes.
- MySQL dictionary: SSL connection error: SSLV3_ALERT_HANDSHAKE_FAILURE ((nullptr):3306)
- Multi-stage proccessing support by rewriting SQL
- Performance issue after upgrade from 20.4.2.9 to 21.11.6.7
- Long locks in DB::DiskLocal::getUnreservedSpace
- Consider using FSST compression for strings
- DB::Exception: There is no role `xxxx` in user directories (version 21.8.13.6 (official build))
- Use FixedString(16) instead of UUID for OpenTelemetry trace_id
- Docs
- C++ not yet supported