clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Make setting `count_distinct_optimization` obsolete
- NATS `nats_handle_error_mode = 'stream'`: a valid message with more than one row throws `Invalid number of rows in Chunk` (debug abort, rows lost in release)
- Write one Iceberg position delete file per data file in ALTER UPDATE and DELETE
- ClickHouse Iceberg catalog: multi-table commits
- Add 7 tests for coverage gaps in 5 components
- Prune object storage, data lake, file and url reads with the GLOBAL IN set of an external table
- Use the vectorized SipHash in `uniqExact` over one `String`, `FixedString` or `IPv6` argument
- Keep the version of a lightweight-update patch part in its name on ATTACH
- Docs: cloud docs updates
- Do not retry a `READONLY` undo stage of a `plain_rewritable` disk without end
- Docs
- C++ not yet supported