clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `set` skip index throws on valid queries with short-circuit guard predicates
- Fix RabbitMQ engine stopping consumption when the backlog exceeds the internal queue
- Backup of lagging ReplicatedMergeTree replica writes stale column comment
- Add a hash of the query plan's shape to `system.query_log`
- Runtime-filter PK pruning drops rows when the join key nests a narrowing `CAST`
- Expand `Merge` table reads into a plan-level `UnionStep`
- Columns cache: let merges and mutations read from it without writing to it
- Use aggregate projections for an aggregation over `UNION ALL` (and expanded `Merge` tables)
- Sparse serialization for typed paths of the JSON type
- `make_distributed_plan` with Cascades checks `max_rows_to_read` against the coordinator's whole-table estimate and rejects in-order reads that stay under it
- Docs
- C++ not yet supported