clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `atomFromDAG` passes NULL constant to `__bitWrapperFunc` which propagates NULL instead of UNKNOWN, causing `mayBeTrueOnGranule` to incorrectly prune matching granules
- Precision loss in extracting Decimal from JSON datatype
- `UnionNode::removeUnusedProjectionColumns` creates asymmetric column counts when `UNION ALL` has mixed EXCEPT/INTERSECT + plain SELECT children
- `parseSize` greedily consumes numeric prefix from HH:MM time rotation strings, creating a spurious byte-size threshold
- `compress` early return before sorting breaks `unique` invariant, producing wrong `histogram` results for small unsorted inputs
- Aliased `PRIMARY KEY` without `ORDER BY` produces unreadable metadata: clone preserves alias, `ParserStorageOrderByElement` rejects it
- `injectRequiredColumns` fallback injects part-only column name not resolvable by `StorageSnapshot` when intersection is empty
- Fix bugs in parseSize() and parseTime() for combined rotate strategy
- Index using aliases does not work in new versions
- Add virtual $name sub-column for Avro union type discrimination
- Docs
- C++ not yet supported