clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Iceberg complex-type schema evolution: tuple-of-map branch uses wrong variable causing schema corruption
- BSI `addValue` full adder never clears bitmap bits → duplicate-index aggregations corrupt when values sum to zero
- Enable read_in_order_use_virtual_row by default
- Lossy compression of floating-point numbers with quantiles
- Add sql compatibility super setting
- Track `MergeTree` metadata memory in async metrics
- Implement CREATE HANDLER: SQL-defined HTTP handlers
- Support iceberg v2
- Push down volume-reducing functions in query plan
- Streaming Watermarks
- Docs
- C++ not yet supported