clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- bloom_filter skip index on a String column prunes all granules for a FixedString constant with trailing zero padding (silent wrong result)
- Parallel replicas with `parallel_replicas_prefer_local_join = 0`: selecting an ALIAS column of the left table of a RIGHT/RIGHT SEMI/RIGHT ANTI join throws NO_SUCH_COLUMN_IN_TABLE
- Add batched key hashing to HashMethodHashed
- Support skip indexes in ranges refiner
- `query_plan_join_shard_by_pk_ranges` + `full_sorting_merge`: correlated `EXISTS` under `OR` throws NOT_FOUND_COLUMN_IN_BLOCK at execution time
- Uninterruptible CPU-bound function evaluation over a large value
- Materialize column statistics on INSERT by default
- Iceberg native writes: concurrent `INSERT`s into a local-disk table silently lose acknowledged rows — the commit CAS is downgraded to a plain overwrite because `LocalObjectStorage` ignores `write-if-none-match`
- Cannot DROP INDEX cause of EXCEED_MAX_PART_SIZE
- Keep the function name of a stack frame attributed to a libc++ `__functional` header
- Docs
- C++ not yet supported