clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Zone relabel skips `JSON` typed paths: whole-`JSON` key drops rows
- Keep a DEPENDS ON cycle of refreshable views refreshing after refresh_retries are exhausted
- Order-dependent aggregate functions process the rows of a sparse column out of order without GROUP BY
- HTTP dictionary fails on relative redirect with percent-encoded path
- SIMILAR TO with custom ESCAPE duplicates `^` in negated bracket `[^...]`
- JSON ADVANCED shared data: per-bucket reads are sequential and bypass prefetch, cold point reads on S3 take ~30 s
- `ARRAY JOIN` with a view boundary between fail with `TYPE_MISMATCH`
- A filter above `LIMIT` / `LIMIT BY` on a join's build side poisons the query condition cache under the key of the `WHERE` below it
- Document macro expansion in Kafka engine settings
- Child re-analysis rewrites `count(x)` the `Merge` did not: `CANNOT_CONVERT_TYPE`
- Docs
- C++ not yet supported