clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- [RFC] GPU Offload of Query Plan Subtrees to Sirius
- CHECK TABLE deletes all parts on a replica with lost Keeper metadata
- `CHECK TABLE` returns 0 on a replica started without Keeper (`NO_ZOOKEEPER`)
- Feat(Map): Add `mapGetOrDefault` function
- `bloom_filter` index rejects `col = Decimal` comparisons with TYPE_MISMATCH
- Multi-step `PREWHERE` swaps a same-named column for a filter column; segfault
- Split `PREWHERE` on `Memory` is 2.6-2.8x slower for non-selective conjunctions
- Constant `indexHint` wrongly pruned below GROUP BY/window/LIMIT BY, losing rows
- Missing-column `DEFAULT` evaluated on scan-substituted `''`, query throws
- An alias inside one column's DEFAULT expression replaces a column of the same name in another column's DEFAULT
- Docs
- C++ not yet supported