clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Use the query condition cache when a filter is moved to PREWHERE after an early row estimate
- Fix a `mapValues` text index dropping rows for a `LIKE` or `match` pattern an absent key's default satisfies
- Do not re-hash repeated short tokens when building `tokenbf_v1`, `ngrambf_v1` and `sparse_grams` indexes
- Keep the inverse dictionary lookup rewrite under `transform_null_in`
- Fix relation statistics edge cases
- Drop columns fully expired by TTL without rewriting the part
- ALTER fails on Merge table with inferred column type keeping source CODEC
- `stddev_over_time` of a constant series is non-zero; NaN for values > 1.34e154
- Reader-added `_watermark` column clashes with a table column of the same name
- Rewrite `arrayExists` over `tokens()` to `hasTokenLike`/`hasTokenMatch` so it can use a text index
- Docs
- C++ not yet supported