clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `ExpressionsStack::push` misclassifies window functions as aggregate functions, blocking nullable conversion for `group_by_use_nulls`
- `SYSTEM RELOAD DELTA KERNEL TRACING` missing `checkAccess` call bypasses `readonly` mode
- `MultiIfToIfPass` and `IfChainToMultiIfPass` skip optimization for Nullable-wrapped expressions, causing `NOT_FOUND_COLUMN_IN_BLOCK` with `group_by_use_nulls`
- Flaky test: 04103_user_network_bandwidth_throttler
- `convertToNullable` in `AggregatingStep.cpp` uses `makeNullableSafe` which skips `LowCardinality` types, making `group_by_use_nulls` ineffective for LC grouping keys
- Iceberg Partition Pruning not properly working with toDate function
- Fix for #101423 GRANT SELECT(column) does not give access to its subcolumns
- Add `output_format_text_max_string_size` for text formats
- Dedicated protected segment in `filesystem_cache` for marks
- Fix `flattenTuple` and `tupleToNameValuePairs` not propagating NULLs for `Nullable(Tuple)`
- Docs
- C++ not yet supported