clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Perf(JOIN): Skip filtering for all-ones join masks
- A `File` table with an absolute path cannot be dropped and blocks `system.tables` after `user_files_path` is changed; with synchronous load the server refuses to start
- A `URL` engine table becomes undroppable and breaks `system.tables` after `remote_url_allow_hosts` is tightened; with synchronous load the server refuses to start
- `S3`/`Azure`/`HDFS`/`Web` engine tables become undroppable and break `system.tables` after `remote_url_allow_hosts` is tightened — `StorageObjectStorage` re-runs the allowlist check on startup replay
- `MySQL`/`PostgreSQL`/`Redis`/`MongoDB` engine tables become undroppable and break `system.tables` after `remote_url_allow_hosts` is tightened; with synchronous load the server refuses to start
- `EmbeddedRocksDB` with a custom `rocksdb_dir`: changing `user_files_path` silently empties relative-path tables and makes absolute-path tables undroppable
- Stable variance merge computes Inf*0: large-value stddev/stdvar become NaN
- Compact reader materializes the partially-read array it is exempted for: LOGICAL_ERROR
- Nested `size0` on a Compact part with no substream marks: Bad cast LOGICAL_ERROR
- `modulo` returns a result or throws depending on whether the divisor is a constant, for divisor Int64::min and for Int64::min % -1
- Docs
- C++ not yet supported