clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Show throttler wait time in the client progress bar
- Normalize trailing zero bytes of String join keys compared with FixedString
- Reclaim objects left by a `DROP` interrupted on a `plain_rewritable` disk
- Reading a few rows of a JSON column from object storage costs one network round trip per substream and takes minutes
- Compact parts: write stripes and read them with a buffer per column
- Allow multiple root workloads
- Look up the default configuration file with all supported extensions (`config.yaml`, `config.yml`)
- Accept a parenthesized key list in TTL GROUP BY
- Support ON CLUSTER for SET DEFAULT ROLE
- Report unknown elements in a disk configuration
- Docs
- C++ not yet supported