clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Do not prune a part by statistics while a `RENAME COLUMN` is pending
- Enable query_plan_join_shard_by_pk_ranges by default
- `WHERE d = const` silently returns 0 rows over a `CAST(DateTime_with_tz, 'String')` primary key — data loss via granule mispruning
- Fix out-of-bounds reads when reading malformed JSON and Dynamic columns
- `GROUP BY` does not collapse a `Nullable(Nothing)` key produced by `UUIDStringToNum(<col>, NULL)` — one group per input row
- Reject `arrayJoin` in projections and `Distributed` sharding keys
- Recompute `MATERIALIZED` columns when a column TTL resets their source
- Fix column loss when a column dropped and re-added with IF NOT EXISTS in the same ALTER statement
- Complete an interrupted part removal when loading outdated parts
- Live flame graphs from streamed profiler samples in the Web UI
- Docs
- C++ not yet supported