clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- [WIP] A new parquet reader that supports filter push down, which improves the total time on clickbench by 50+% compared to arrow parquet reader
- Support async io prefetch for native orc reader
- Postgres certificate error
- Additional primary key scan for skip index FINAL queries
- Minimize memory copy in port headers during pipeline construction
- `TRIM` does not support empty trim characters, pt. II
- Fix NATS integration tests
- Enable new strategy of selecting parts to move between storages in `storage_policy`: Select oldest parts.
- use hardlinks instead copy for broken parts in S3
- dead_letter_queue system table to keep erroneous incoming messages
- Docs
- C++ not yet supported