clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fit the insert pipeline and merges into a small server's memory
- AI functions: add per-user / per-role token and API call budgets
- Split the data written into files and objects by size
- Add the function composition operator `f | g` and argument placeholders
- Over-strict debug guard in `MergingSortedAlgorithm::checkVirtualRowCoversSortDescription` aborts debug builds when `optimize_distinct_in_order` widens the sort description past a constant-prefix-folded virtual row
- S3 plain disk cannot remove objects in batch within one S3 request.
- Export system logs to the CI Logs cluster from integration tests
- Measure the client chime threshold on the client's own clock
- Fix a data race on the lazily calculated column and index sizes in MergeTree
- Cascades: run a `PARTITION BY` window on each node
- Docs
- C++ not yet supported