clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Cherry pick #129139 to 26.3: Reject MySQL hosts that the client library would reinterpret, and check `remote_url_allow_hosts` in the `MySQL` database engine
- Cherry pick #129139 to 26.8: Reject MySQL hosts that the client library would reinterpret, and check `remote_url_allow_hosts` in the `MySQL` database engine
- Cherry pick #129139 to 26.9: Reject MySQL hosts that the client library would reinterpret, and check `remote_url_allow_hosts` in the `MySQL` database engine
- Update docs with safety warning for `use_environment_credentials`
- RFC: GRANT QUERY GRANTS(...) - derive and grant the minimal privilege set for a query or set of queries
- Iceberg, S3 and file(): Map key and value filters read the whole map; reading m.keys/m.values from their Parquet column makes them up to 14x faster when the map is the only column read
- Docs: clarify self-managed backups for regulated envs
- IcebergS3 INSERT waits for the upload of each data file before writing the next one; overlapping the uploads makes a single-stream INSERT 3x faster
- Apply the query condition cache of each replica with parallel replicas
- Parquet on S3 and Iceberg: every warm read requests each file's offset index again; keeping it with the cached footer makes an IcebergS3 scan of 102 files 28% faster
- Docs
- C++ not yet supported