clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Read the lazily materialized columns of Iceberg and other object storage files in parallel: Iceberg `lazy_materialization_join` up to 4x faster, 6x with S3 latency
- Column TTL on one Nested field silently clears another field
- fileCluster: a filter on a view over the table function is still not sent to the replicas after #125615
- [UpSync]: Sync critical files
- Reduce Keeper part listing during replicated part fetches
- Switch to CLA-Assistant GitHub App for higher Rate Limits
- Native ORC reader decodes Nullable(Float32/Float64) values byte by byte; one copy makes these reads 30-44% faster
- Extract the per-part `MergeTree` index analysis into `analyzeSinglePart`
- Experimental ReaderExecutor reads local files in 8 MiB windows: legacy-sized pread windows bring it to legacy-reader speed
- TLS certificate/key hot-reload breaks all connections if reload occurs between cert and key rewrite
- Docs
- C++ not yet supported