clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Iceberg: Ignore Parquet columns whose field id is not in table schema
- Reject reading an `EPHEMERAL` column that has the name of a subcolumn of another column
- Use vectorized SipHash in `uniqExact`, `IN` sets and `DISTINCT`, with the same hashes
- Optimize PREWHERE by filtering text index hints before string reads
- Sync shared files changed by the private `AmberMap` PR
- Fix `uniq`, `DISTINCT` and hash `JOIN` treating different `JSON` and `Dynamic` values as equal
- Remember a plan with parallel replicas that automatic mode could not use
- Hide memory addresses in Kafka logs
- chore(docs): remove upgrade schedule section for BYOC operations docs
- After SYSTEM RESTORE REPLICA, lightweight UPDATE fails with "Found patch part ... that intersects mutation" (LOGICAL_ERROR) and can silently skip rows
- Docs
- C++ not yet supported