clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Release the replication queue attempt booking when the executor refuses the task
- Respect free disk space in TTL drop merges that keep rows
- Fix a correlated subquery whose PREWHERE references a column of the outer query
- Introduce `RelationStatsCache`
- Fix a crash when a skip index analyses an IN set truncated by set_overflow_mode = 'break'
- 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
- Docs
- C++ not yet supported