clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Keep the stable task distribution of object storage files when replicas are balanced
- Add a stateless tests run with plan-based parallel replicas
- Remove the legacy Delta Lake reader
- Add the `FirstApplicable` codec combinator
- DataLakeCatalog REST: DROP TABLE on a managed Databricks Unity table deletes its data even with iceberg_delete_data_on_drop = 0
- MergeTree PREWHERE keeps filtering before `EventDate >= '2013-07-01'` and `URL <> ''` because they count as able to throw; recognizing that they cannot makes ClickBench Q37/Q38 9-21% faster on top of #128442
- Merge Iceberg manifests on append
- Evaluate libbz2-rs-sys as an opt-in bzip2 replacement: compatibility, benchmarks and slow-case optimization
- Build arrays of arrays in function `array` without virtual calls per element
- Reject a composite value that does not fit its type in `INSERT ... VALUES`
- Docs
- C++ not yet supported