clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Iceberg: parallelize manifest file loading to fix 3s cold-cache bottl…
- Add histogram metrics for Azure read request duration and bytes
- plans for allow_experimental_cluster_discovery setting
- `mysqlDayOfMonthWithSpacePadding` leaves `dest[0]` uninitialized for day<10 in variable-width formatter path (sibling of the `%f` bug this PR fixes)
- floatBitTrim function
- Copy-paste typo in `IIcebergSchemaTransform::transform` ARRAY case assigns `tmp_node_array` instead of `tmp_node_map`, breaking schema evolution on `Array(Map(K, Tuple))`
- `StorageMerge` filter `WHERE _table='X'` returns no rows when underlying table has a physical `_table String` column shadowing the virtual
- pointwiseEqual post-loop sign-extension check unconditionally applies signed two's complement logic, returning empty for unsigned values with the high bit set
- `return` in `updateMatchedColumnsFromJoinUsing` exits entire function, skipping type updates for subsequent USING columns
- PR #96022 validation removed by later refactoring: RENAME COLUMN before UPDATE/DELETE on same column violates ALTER atomicity
- Docs
- C++ not yet supported