clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Negative `LIMIT` + `LIMIT BY` over `Distributed`: per-shard tail truncation returns rows outside the correct `LIMIT BY` output
- Finish the LONG_IS_A_DISTINCT_TYPE conversion, and fix it for wasm64
- `grace_hash` + correlated `EXISTS` with `RIGHT JOIN` on a `JSON` key: logical error `Invalid state transition, expected WRITING_BLOCKS, got JOINING_BLOCKS`
- `ProfileEvents` per-CPU sharding calls `getCurrentCPU` unconditionally — a `SYS_getcpu` syscall per increment on AArch64 without rseq
- Fix duplicated keys in nested distributed aggregation with out of order buckets
- Implement PromQL functions absent and count_values
- Radix select for the quantileExact family
- Do not apply parallel replicas to the child plans of a Merge table
- Azure: fix listObjects dropping the endpoint prefix on pages after the first
- Keep the part minmax index over `_block_number` / `_block_offset` across a reload of a mutated part
- Docs
- C++ not yet supported