clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Skip the out-of-lookup-table range check in `toYYYYMMDDhhmmss` for `DateTime` and `Date`
- Evaluate a non-deterministic function per row over a `LowCardinality` argument
- PromQL whole-metric selector probe re-executes a nested SELECT on every query, dominating plan time for small instant queries
- Deny `SYSTEM DROP DATABASE REPLICA` for users without privileges
- argMin/argMax/intervalLengthSum persist unvalidated parameters into unparseable state type
- Extend reading in reverse order with FINAL to Merge tables and topKThroughJoin
- Make the lazy-load table stand-in transparent to system tables, DML and `BACKUP`
- TTL merge silently drops a whole part based on ttl.txt written by pre-fix versions with the DateTime overflow bug, without re-evaluating rows with the fixed expression
- Simplify column statistics configuration: Remove explicit statistics DDL
- Fix wrong `DISTINCT` results with `WITH FILL` when a generated row defaults a sort key
- Docs
- C++ not yet supported