clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Report INCORRECT_DATA instead of LOGICAL_ERROR when a part does not match the declared sorting key
- Do not merge patch parts across the data version of an in-flight merge or mutation
- Fix text and token skip indexes over-pruning a map element whose default matches the predicate
- [TEST] Read time series table functions on parallel replicas
- Milestone 2 - Add the executed query plan to system.query_log
- Make a PostgreSQL read cancellable while it is streaming
- Align SYSTEM REFRESH VIEW while stopped/paused with streaming engines
- TimeSeries: the samples timestamp default CODEC(DoubleDelta, ZSTD(1)) costs read time - CODEC(Delta, T64, LZ4) is 5-12% faster on four PromQL queries, slightly smaller and cheaper to write
- Do not run `BlobKiller` and `BlobCopier` threads for disks that never need them
- Allow non-UTF-8 `String` bytes in the `JSON` type
- Docs
- C++ not yet supported