clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Wrong totals result with query_plan_merge_expressions disabled
- Add random projection functions for changing dimensionality of vector embeddings
- Allow creating table as table function with another engine
- Add arrayPermutations, arrayPartialPermutations, and arrayCombinations
- Implement FIFO admission queue with per-waiter wakeup for ProcessList
- Add per-part aggregation cache for incremental GROUP BY
- `broken_parts == broken_parts_to_enqueue_fetches_on_loading` assertion in `ReplicatedMergeTreeQueue::createLogEntriesToFetchBrokenParts`
- Add S3/GCS sources support to Dictionary to load from Parquet
- AWS SQS table engine
- Sampling via geometric distribution
- Docs
- C++ not yet supported