clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Use a non-NULL placeholder for a Nullable scalar subquery in only-analyze mode
- countIfOrNull over Nullable counts NULL rows for non-0/1 condition bytes
- Pre-epoch `DateTime64` fraction truncated toward zero: `toStartOf*` rounds up
- valid_before_epoch checks whole minutes, not whole N minutes, for N-minute intervals
- `roundDown` skips intra-day offset change: `toStartOfHour` gives :30 buckets
- Chained `json['a']['b']` flattened across a typed path reads the wrong subcolumn
- groupArrayInsertAt deserialize ignores the declared length; result column offsets desync
- `histogram` missing `is_order_dependent`: sort removal changes its bins
- External tags `id` type with no automatic generator: CREATE now refused
- Apply RESTORE storage_policy override to materialized view inner table
- Docs
- C++ not yet supported