clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- -Map String-key sort copies both keys per comparison: finalize 2x slower
- `rewrite_in_to_join`: `IN` in SELECT gets the join default on the totals row
- `rewrite_in_to_join` resolves IN left argument inside the subquery
- `s3` Parquet `count()` returns a partial row count cached by a TopN read
- Wrong `ORDER BY ... LIMIT` results on column-mapped Delta Lake tables
- Parallel replicas: `Distributed` read fails on shard lacking the cluster
- CACHE dictionaries can stall under high concurrency and do not recover without manual intervention
- `max_temporary_tables` wrongly counts temporary views
- `file()`/`url()` schema and row-count caches ignore `compression_method`
- Add a setting to capture the query plan of only a sample of queries
- Docs
- C++ not yet supported