clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix projection matching regression from `removeTrivialWrappers` in `appendExpression`
- fixing a possible underflow while parsing postgres array values
- Documentation syntax for BACKUP ASYNC appears incorrect
- Unit tests (tsan, function_prop_fuzzer)
- Improve function_prop_fuzzer
- Make AsyncReadCounters lockless
- `supportsSkipIndexesOnDataRead` disables only `max_rows_to_read`, not `_leaf` variants — `SETTINGS max_rows_to_read_leaf=N, read_overflow_mode_leaf='throw'` queries throw TOO_MANY_ROWS even when skip index would reduce to 1 row
- Fix iceberg stats with partitioned table
- Use progress-based timeout in ZooKeeper client to avoid killing healthy sessions under load
- Add regression test for Nested CLEAR COLUMN crash (issue #89537)
- Docs
- C++ not yet supported