clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- toUUIDOrZero does not recognise invalid UUID
- High znode count (~90k) causes instability in Keeper/ClickHouse replication
- Projections return stale data after materialized column modification
- PRIMARY KEY expression in column declaration does not work with COMMENT
- Logical error: 'persistent_components.format_version == metadata_object->getValue<int>(f_format_version)''
- Iceberg Rest Catalog: DB::Exception: Unable to parse ExceptionName: InvalidRequest Message
- Support subcolumns in projections.
- Cap’n Proto: adding new Data field mapped to UInt256/UInt128/DateTime64 fails on old messages with Unexpected size of UInt256 value: 0
- Optimizer: use full_sorting_merge when it won't have to sort
- ClickHouse 25.8: Slow Shutdown After TERM Signal
- Docs
- C++ not yet supported