clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Explain analyze works for Streaming queries
- Keep an S3Queue file retryable after losing the race for its `processing` node
- Fix `deriv` to scale its slope by the timestamp tick resolution
- Fix JOIN with a Join-engine table whose key type is narrower than the left key
- [RFC] Query Acceleration: derived structures for transparent query rewrite
- Forbid lazy JSON type-hint ALTER that would corrupt primary key or index
- Fix a Keeper follower staying out of quorum after its successful snapshot install is discarded
- Supporting lazily replicated arrays on arrayElement and arraySlice (reduces memory usage and improves performance)
- query_plan_join_shard_by_pk_ranges + full_sorting_merge: NOT_FOUND_COLUMN_IN_BLOCK when the right side filters on a non-join sort-key column
- Implement PromQL functions max_over_time() and min_over_time()
- Docs
- C++ not yet supported