clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Do not throw a logical error when an ephemeral node is held by someone else
- `Cluster` database engine
- A `ddl_mode` setting for the `Remote` and `Cluster` database engines
- Add SHARED REGEXP path placement policy to JSON
- S3Queue: swallowed `after_processing='delete'` failure silently re-ingests files as duplicates
- CTE column alias list is not checked for duplicate names; columns silently collapse
- Join order optimization at default settings builds the hash table from a ~320x-underestimated join intermediate: 64x read amplification on duplicated keys (identical results)
- Backport #111483 to 26.6: Restrict local object access only for user files path
- INSERT on a DDL-lagging Replicated-database replica silently skips an un-applied materialized view's cascade, permanently losing the acknowledged rows from the MV target
- Refuse Iceberg data compaction until it can publish its result
- Docs
- C++ not yet supported