clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- JSON formats: parse `new ISODate("2024-05-29T23:16:12.256Z")` as `DateTime64(3)`
- Calculate `minmax` index from primary key columns
- Support Ceph RADOS
- Missing way of dealing with out of capacity in Arrow and ArrowStream formats
- Implementing "move part to shard" feature with Fixes
- A query does not work with parallel replicas.
- Parallelize listing of files on S3
- The query result of the distributed table groupBitmapOr is inconsistent with the expected result
- ASSUME CONSTRAINT not optimizing queries with MATERIALIZED COLUMNS
- S3Queue table is producing listing calls excessively
- Docs
- C++ not yet supported