clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- PostgreSQL subquery pushdown backticks `ROLLUP`/`CUBE`, PostgreSQL rejects it
- Totals(T) type: a marker for ROLLUP/CUBE/GROUPING SETS subtotal rows that can't clash with real key values
- PromQL: rejected selector followed by `offset`/`@` throws `LOGICAL_ERROR`
- Nested lambda inside arrayJoin lowering draws per row, not per source row
- Legacy `arrayJoin` mode changes `WHERE` `rand()` draws instead of keeping them
- Silent data loss: OPTIMIZE FINAL that waits for a running merge keeps a stale metadata snapshot, so a concurrent RENAME COLUMN is stamped as applied but written with the old name
- Concurrent `file()` inserts with multiple files share one file: rows lost
- Authorization via Open Policy Agent
- fix: Include read columns when updating `MergeTreeBlockSizePredictor`
- Fix cluster discovery with `secure` enabled
- Docs
- C++ not yet supported