clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Server start hangs or aborts replacing an obsolete `all_*` log table
- `INTERPOLATE` refuses a projection `arrayJoin` under `group_by_use_nulls`
- Seal-gated reading: logical error `filter && filter->isReady()` when the JOIN build side stops early (`join_overflow_mode = 'break'`)
- Terminate on exceptions in the workload scheduler thread
- `arrayProduct` silently returns wrong results when an integer or `Decimal` product overflows
- Support expiration of idle, empty Distributed delivery queues
- Variant JSON paths store Array(JSON), so arr[].x returns []
- Parquet schema cache ignores `input_format_parquet_detect_variant_by_structure`
- Shipped JOIN fragment clone fails on negative/fractional `LIMIT`/`OFFSET` steps
- toDaysSinceYearZero(DateTime) ignores the time zone, counts the UTC day
- Docs
- C++ not yet supported