clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add a performance test for dictionary-based row group filtering in Parquet
- Constant ROLLUP/CUBE key not defaulted to NULL on super-aggregate row
- Cascades optimizer rejects LEFT ANY/SEMI/ANTI JOIN with
- GLOBAL RIGHT/FULL JOIN samples wrong table after side swap, dropping rows
- `json['key']` fails on `LowCardinality` typed paths and on NULL nullable keys
- Query condition cache salt omits JSON/CSV output-format settings
- Validate deserialized analysisOfVariance state
- RESTORE fails on EmbeddedRocksDB table used as refreshable-MV target
- Trino dialect: shift literals promoted to Int64 instead of 32-bit INTEGER
- Use plain LRU for the query-local text index caches
- Docs
- C++ not yet supported