clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Segmentation fault in CPULeaseAllocation
- 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))`
- Flaky test: 03258_nonexistent_db
- Flaky test: 01473_event_time_microseconds
- Flaky test: 02293_http_header_full_summary_without_progress
- Server SEGFAULT in `SingleValueDataGenericWithColumn::read` for `singleValueOrNull(JSON)` because `result_type` (`Nullable(JSON)`) is passed instead of `value_type` (`JSON`)
- `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
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- C++ not yet supported