clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- System-table narrowing reads a `break`-truncated set's incomplete elements
- `tuple(x) IN` decoded as `x IN` by `analyzeSet`: rows dropped, wrong shards
- Lazy S3Queue table unusable after RENAME DATABASE (UNKNOWN_DATABASE)
- Large LIMIT pushed to SQLite/PostgreSQL fails instead of being clamped
- MySQL/PostgreSQL `LIMIT` push-down drops rows under case-insensitive collation
- `numbers`/`primes` `LIMIT` hint ignores joins from correlated subqueries
- Log Prometheus requests in query_log with their interface and HTTP method
- Score classic histogram and stale-marker evals in the PromQL extended-support test
- Evaluate PromQL compliance range queries over 61 steps
- Answer a timed-out Prometheus remote write with 503
- Docs
- C++ not yet supported