clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Replace collision-chain eviction with global LRU in
- num_defaults is wrong in part serialization.json for numeric column
- Invalid number of rows in Chunk with lazy materialization between v25.8 to v25.11
- Enable Arrow/Parquet SIMD optimizations (NEON on ARM, SSE4.2 on x86)
- extra_float_digits incompatibility on PostgreSQL port (9005)
- Add experimental LATERAL JOIN support
- ClickHouse does not support multiple geo types in one column
- Forward incompatibility in 26.2: `Remove unnecessary parentheses in CREATE TABLE ... AS SELECT ... COMMENT`
- KILL QUERY ignored during single-threaded CPU-bound block processing
- Kafka Engine: `_key` and `_headers` not properly handled when producing messages (v25.8.11.66)
- Docs
- C++ not yet supported