clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- System log flushes use memory overcommit instead of failing at the server memory limit
- Rebuild projections that compute from a column whose type `MODIFY COLUMN` changes
- Interpret `DateTime` literals of a table `TTL` in the session time zone
- Read subcolumns after the `FINAL` merge of value-combining engines
- Hash join sporadically matches (almost) every left row against the whole right table: JoinResultRowCount inflates ~40,000x with identical query, settings and data
- Fix `bloom_filter` index skipping rows for a `Date32` constant compared with a `DateTime` column in another time zone
- Inventory `-Wunsafe-buffer-usage` and ratchet one security-sensitive directory
- Apply a row policy that the read cannot evaluate before the query's `PREWHERE` and `WHERE`
- Measure libc++ `EXTENSIVE` hardening in release builds
- Fix duplicates in StorageKafka2: consume exactly the intent size on batch replay
- Docs
- C++ not yet supported