clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `normalizeDivision` misses `APPLY` lambdas, row-policy and additional filters
- MySQL dictionary `EXPRESSION v / 2` stored as `divideExact`: load fails
- intDiv constant kernel returns 0 for INT32_MIN divided by 2^31
- EXPLAIN WHATIF reports too close to call under prefer_optimize_projection = 1
- SQL-defined handlers break when request dialect is logsql
- Run the tsan, msan and LLVM coverage jobs on ARM runners
- Text index on mapKeys/JSONAllPaths rewrites value token searches, losing rows
- Layer filter key names miss aliased `sample_block`: FINAL `UNKNOWN_IDENTIFIER`
- Sharded hash JOIN fails with NOT_FOUND_COLUMN_IN_BLOCK on unread key column
- Absent delete totals rewritten as `0`: trivial `count()` counts deleted rows
- Docs
- C++ not yet supported