clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `multiSearchAny` on a map element throws BAD_GET with a mapKeys tokenbf index
- Skip index on Map `t.a` drops rows matching sibling Map `t.a.key_b`
- mapKeys bloom_filter/tokenbf_v1/ngrambf_v1 index prunes rows missing the key
- Compact symbols decompress a granule per frame: `trace_log` flush 100x slower
- Synthetic `READ_COLUMN` trips `throw` mode: Wide `MATERIALIZE INDEX` stuck
- ALTER UPDATE of a parent column leaves Wide-part subcolumn skip index stale
- Do not claim `toStartOfInterval` and `dateTrunc` are monotonic over a `Date32` range they wrap
- Convert the Parquet PREWHERE filter to a bitmask once per call when decoding dictionary indexes
- Skip Parquet row groups by their dictionary for `ORDER BY <String> LIMIT` when the filter rejects the empty string
- Fix a data race on the gRPC output buffer with the `Pretty` squash thread
- Docs
- C++ not yet supported