clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- arrayShiftLeft/arrayShiftRight reject Dynamic and Variant arguments
- arrayShift* denulls Enum default with raw 0: UNKNOWN_ELEMENT_OF_ENUM
- Upgrade check: mutation of an empty `DETACH PART` tombstone revived by a restart retries `UNKNOWN_IDENTIFIER` until cleanup drops it
- FLBA read as String: stats/bloom keep padded bytes, trimmed value unfindable
- Support EXCHANGE DATABASES db1 AND db2 for atomic swap of entire databases
- `groupArraySampleTuple` via `-Tuple` reported deterministic, corrupts MergeTree
- `topK` + 9 more: Decimal parameter makes the persisted column type unloadable
- Feat(MergeTree): Allow `MergeTree` key columns to widen integer types
- `arrayShuffle` seeded shuffle result depends on `max_block_size` — deterministic-given-seed contract violated
- `LEFT JOIN` / `SEMI LEFT JOIN` with non-equi `ON` accepted only when `query_plan_split_filter = 1` — optimization flip changes acceptance predicate
- Docs
- C++ not yet supported