clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Read and checksum the UNIQUE KEY dense-index SST through IDataPartStorage
- Keep the column default when another MODIFY COLUMN restates the type
- CI: run the full test suite only when review threads are resolved
- Support DEFINER / SQL SECURITY for dictionaries
- Stop retrying S3 reads after query cancellation
- Automatically set make_distributed_plan=1 when distributed_plan_workers_num != 0
- Final DISTINCT pass is single-threaded and does not scale with `max_threads`
- Fix wrong results for non-boolean conditions taken out of `and`
- Deduplicate the final DISTINCT in parallel
- Lazy FINAL with `optimize_aggregation_in_order` merges one group at a time (25000 `mergeBlocks` calls and 50000 log lines for a 35000-row table)
- Docs
- C++ not yet supported