clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Tables persisted with an off-grid `Fixed/UTC±HH:MM:SS` time zone become unloadable after upgrade: no SQL can read, drop, or detach them, and with `async_load_databases = false` the server does not start
- DateTime64 query parameters lose the sign for negative subsecond timestamps
- Require the local privilege for KILL and SYSTEM statements over ON CLUSTER
- A settings profile persisted with an off-grid `Fixed/UTC±HH:MM:SS` `session_timezone` makes the upgraded server fail to start; a user with such a setting is locked out and breaks `system.users` queries
- Parquet signed INT32/INT64 statistics are applied as bounds in a hinted unsigned type's order: point lookups under a UInt32/UInt64 schema hint silently return no rows
- Dynamic query parameters lose their type and can change values
- DeltaLake: an out-of-range comparison literal is wrapped by a non-accurate cast into the data-skipping predicate, silently dropping rows
- Support HTTP archive reads in `url` and `urlCluster`
- HTTP profile can override explicit settings when they match the current value
- Add `analyzer_alias_hides_table_name`: let an alias hide the table name from a qualifier
- Docs
- C++ not yet supported