clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Iceberg compaction after a DELETE on a schema-evolved table rewrites the metadata as `v0` and makes the table permanently unreadable
- Async INSERT into DeltaLake with wait_for_async_insert=0 is acknowledged when allow_delta_lake_writes=0, rows silently dropped at flush
- Parallel replicas reject FULL/PASTE JOIN against non-MergeTree side (code 264)
- `PullingAsyncPipelineExecutor::cancel` / `max_execution_time` / `KILL QUERY` waits for the full S3 retry budget on a stuck S3 source
- Iceberg: emit catalog labels from the embedded Iceberg REST catalog
- Parallel replicas INSERT SELECT into a DeltaLake table commits once per replica: commit conflict, lost or partial data
- Refuse a Delta Lake change data feed read that would be distributed over a cluster
- Fix(MySQL): MySQL replace_query boolean literals
- Fix(MySQL): MySQL binary string literal escaping
- Resolve `{shard}` and `{replica}` from a `Replicated` database on `ATTACH` as on `CREATE`
- Docs
- C++ not yet supported