clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 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
- Add aggregate function `gini`
- 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
- Fix dropped tables being pinned by killed system.replicas queries
- Reduce peak memory when writing Array(JSON) shared data in buckets
- Docs
- C++ not yet supported