clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix IEJoin key pair choice for band-shaped conditions on unrelated columns
- Fix a deadlock when one query reads system.stack_trace twice
- Keep an aliased tuple element index inside its parentheses when formatting the `.N` operator
- Fix Bad cast from ColumnReplicated to ColumnQBit in arraySlice
- Fix wrong count() after a metadata-only MODIFY COLUMN to Nullable
- `GROUPING()` over a `Distributed` table throws 47 `Unknown expression or function identifier __grouping_set` when the grouping-set mask constant exceeds `optimize_const_name_size` (30 keys at the default)
- Stop deciding the JOIN-kind rewrite from assumeNotNull of a NULL
- Fix quadratic key packing in aggregation in order and DISTINCT in order
- Replace `_pdep_u64` in `combineFilters` with a `pshufb` expand table
- Equal-typed equi-key push-down has none of the new guards: wrong results
- Docs
- C++ not yet supported