clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add a performance test for PromQL rate and sum of rate range queries
- Native `JSON`: shared-data path repeating a dynamic path throws `LOGICAL_ERROR`
- Keep the samples of timeSeriesRate/Increase/DeltaToGrid in one sorted buffer
- `TimeSeries` dedup cache keeps a stale entry after a failed multi-block insert
- toString(x, tz) monotonicity ignores tz, causing wrong ORDER BY/GROUP BY
- MODIFY ORDER BY accepts new Nested member that isn't actually sorted
- Skip a JSON null in a number column with input_format_allow_errors_num
- Orphan repair rewrites `numChildren` the log-tail guard never checks
- `groupArrayInsertAt` state with a `Decimal` default: the type name does not round-trip, the table rejects its own states after a restart
- Add `system.engine_settings`
- Docs
- C++ not yet supported