clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `UniqueKeyTxnCommit::insert` skips `max_temporary_table_size_bytes_*` check
- `ROWS` windows and 1-row partitions 10-19% slower: unused peer-group end search
- min/max/count from column statistics is disabled by any WHERE, even for parts that the index analysis proves fully match the filter
- Partial result on select without initimation when data part is corrupted.
- `max_rows_to_read` and `max_bytes_to_read` are ignored for `Memory`, `Log` and `TinyLog` tables
- Fix NATS consumer starvation during flush intervals
- Aggregate functions return 1970-01-01 instead of the Date32 default 1900-01-01 on empty input (also with -OrDefault)
- Server shutdown lists every external database (`DataLakeCatalog`, `MySQL`, `PostgreSQL`, `Remote`, ...) remotely; about 30 s per `DataLakeCatalog` database when the catalog does not answer
- Vectorize `sum` and `avg` of `Decimal32`, `Decimal64`, `Decimal128`, `Int128` and `UInt128`
- Drop the `GROUP BY ... LIMIT` kept-keys cutoff from the per-replica aggregation of plan-based parallel replicas
- Docs
- C++ not yet supported