clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Constant `indexHint` wrongly pruned below GROUP BY/window/LIMIT BY, losing rows
- Missing-column `DEFAULT` evaluated on scan-substituted `''`, query throws
- An alias inside one column's DEFAULT expression replaces a column of the same name in another column's DEFAULT
- -Map String-key sort copies both keys per comparison: finalize 2x slower
- `rewrite_in_to_join`: `IN` in SELECT gets the join default on the totals row
- `rewrite_in_to_join` resolves IN left argument inside the subquery
- `s3` Parquet `count()` returns a partial row count cached by a TopN read
- Wrong `ORDER BY ... LIMIT` results on column-mapped Delta Lake tables
- Parallel replicas: `Distributed` read fails on shard lacking the cluster
- CACHE dictionaries can stall under high concurrency and do not recover without manual intervention
- Docs
- C++ not yet supported