clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix correlated subquery + GROUP BY ROLLUP under group_by_use_nulls
- Revert "Parallelize reads from a single Parquet file in StorageFile"
- Fix Arrow time32/time64 wrongly picking up timezone when inserted into Time/Time64
- Fix extractAll and similar functions on Nullable inputs
- Add clear and /clear terminal meta-command for client and local
- Block structure mismatch (AMBIGUOUS_COLUMN_NAME) when projection is picked and SELECT alias collides with source column name (regression from #88798)
- `timeSeriesRange`/`timeSeriesFromGrid` silently truncate `Int64`/`UInt64` step to lower 32 bits for `DateTime`/`UInt32` timestamps
- Duplicate KV argument in `s3(...)` throws `LOGICAL_ERROR` instead of `BAD_ARGUMENTS`
- `JSON_EXISTS` / `JSON_QUERY` access `generator_json_paths[0]` on empty `std::vector` when given empty `Tuple()` or empty `Array(String)` JSONPath argument — undefined behavior / segfault
- Analyzer generates single `MergingAggregatedTransform` for distributed GROUP BY with `LEFT ARRAY JOIN`; coordinator OOMs
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