clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- uniq drops to saturated 32-bit estimate when 64-bit sample thins below 8192
- Fix JOIN USING keys from aliases colliding on a synthesized `_` name
- Keeper lock timeout not clamped: huge value overflows `try_lock_for`
- Block nested loop join never calls addExecutedJoin, used_number_of_joins stays 0
- `checkDataPart` skips `txn_version.txt` only if it existed before the scan
- Feature request: persist table owner/definer on CREATE TABLE (like materialized views)
- areEquivalentKeys treats sibling nested keys as overrides of each other
- Merge over lazily loaded child ignores share_nested_offsets = 0
- `IN` with NULL inside `Array(Nullable)` set fails bloom_filter index analysis
- KQL Boolean conversion prevents primary-key pruning
- Docs
- C++ not yet supported