clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add `ATTACH PART` part-name preservation setting
- Text index: exact hasPhrase on Array columns with a position increment gap
- Format query in the query prompt in clickhouse-client instead of echoing by default.
- Fix wrong results of `Merge` and `Distributed` when a column on one side is a subcolumn or a virtual column on the other
- `timeSeries*ToGrid` 14-24x slower on series with a mid-range gap
- max_cpu_share workload scheduling not working for unprivileged users
- Read-in-order misplaces NaN/NULL nested in Tuple/Array sorting keys
- ORDER BY elided after sort through negate, wrong NaN/NULL placement
- NaN-placement check trusts `sign`/`roundDuration` to keep NaN: sort elided
- Join reordering builds the hash table from the large Iceberg table when a side has no row estimate: TPC-H Q3/Q8/Q17 over Iceberg are 10-30x slower since 26.5/26.6
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