clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add reproducers for the AllocationQueue self-deadlock on eviction
- Fix heap-use-after-free after a streaming read round whose sort spilled to disk is torn down
- Refuse RENAME DATABASE for detached and not loaded S3Queue/AzureQueue tables whose keeper_path expands {database}
- Use the top-K heap boundary of GROUP BY ... LIMIT to filter Parquet reads
- Fix reading Iceberg tables identity-partitioned by a `uuid` column
- Parquet GROUP BY ... LIMIT still reads every row: pass the top-K heap boundary of #121145 to format reads (ClickBench Q18 over Parquet −92%)
- Fix INTERPOLATE reading another column when a target is named like an expression
- Fix `RENAME` and `EXCHANGE` in a `Replicated` database mounted under different local names
- Fix INTERPOLATE expressions that read another INTERPOLATE target
- `hop` functions throw `Time overflow` on NULL rows and `LowCardinality` input
- Docs
- C++ not yet supported