clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `max_table_size_rows` has no shrinking exemption: size-neutral merge/mutation rejected
- Lightweight update silently skips acknowledged rows in a partition whose local parts were all empty at submission — partition pruning freezes the read bound before the update_sequential_consistency sync
- ALTER payload list omits `partitions`: `IN PARTITION p1, p2` mutation silently no-ops
- Fsync the parts of an INSERT once, at the end of the query
- OPTIMIZE TABLE stamps manifest-wide Iceberg stats on every data_file entry
- Join contiguous key hash
- runningAccumulate still opts into short-circuit lazy execution: wrong values
- Parallelize ordered merge output materialization
- Parallelize merging of large uniqExact states in aggregation with keys
- Normalize Iceberg partition values in the identity-projection path
- Docs
- C++ not yet supported