clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- jemalloc.metadata allocates RAM and does not return it
- Reuse the header columns for the first chunk of `VirtualRowTransform`
- Use the keys found by a paged GROUP BY … ORDER BY min(sorting_key) LIMIT n OFFSET m for skip-index and ARRAY JOIN pruning
- Inventory `-Wunsafe-buffer-usage` and ratchet one security-sensitive directory
- Projection with WHERE: parts without a matching row get no projection part and never merge with parts that have one
- Add a server setting that lets the seccomp policy refuse `perf_event_open`
- Refuse `io_uring` in the seccomp policy unless the server configuration uses it
- Re-execute the server process that the watchdog starts, to give it a fresh address space layout and stack canary
- Not for merge: build the release binaries with Clang CFI to measure its cost
- Report the original error instead of `CANNOT_WRITE_AFTER_BUFFER_CANCELED` after a failed adaptive aggregation spill write
- Docs
- C++ not yet supported