clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `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
- Read-in-order treats `toDateTime` over a `Date`/`Date32` sorting key as monotonic though the conversion wraps: `ORDER BY ... LIMIT` returns wrong rows at default settings
- `modulo` returns a result or throws depending on whether the divisor is a constant, for divisor Int64::min and for Int64::min % -1
- EXISTS over a keyless aggregate returns false when the subquery builds a set
- `isNull` and `IS NULL` return the raw null-map byte instead of a boolean — `sum(x IS NULL)` overcounts, `GROUP BY x IS NULL` yields three groups, and a `(x IS NULL) = 1` filter silently drops NULL rows
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- C++ not yet supported