clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Wrong results: GROUP BY two ALIAS columns with the same expression over a Distributed table duplicates groups under two-level aggregation
- Fix NaN rows dropped by CNF folding of negated ordering comparisons
- Query planner stuck for hours in bloom_filter index analysis when WHERE references a large scalar subquery Map, query cannot be killed
- Reject malformed compressed Arrow IPC buffers before allocating for them
- Add `sorted_merge` and `parallel_sorted_merge` join algorithms
- Refreshable MV: apply `RANDOMIZE FOR` per replica
- Resolve the 25.8 cherry-pick conflicts of #110584
- Use `pread` when `preadv2` with `RWF_NOWAIT` cannot be used, and recognize `EPERM` from it
- CI log parser: find the `Format string` line despite interleaved log lines
- Do not report "Server died" for a signal-killed run with no failure
- Docs
- C++ not yet supported