clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Support `GROUPS` frame mode for window functions
- Fix allocator abort in validateColumnOfFixedSize for huge index_granularity
- Avoid vertical TTL delete for TTLDrop merges
- Reclaim idle threads across all server thread pools
- Support triggering Materialized Views during ATTACH / REPLACE PARTITION
- Add basic support for ISODate("2024-05-29T23:16:12.256Z") JSON parsing
- Predicate on `LIMIT BY` key columns is not pushed below `LIMIT BY`
- TTL GROUP BY + SET on a sort-key column corrupts merge output (Sort order of blocks violated; silent primary-key index corruption in release builds)
- Iceberg S3 path isn't cleaned up after DROP TABLE
- tryOptimizeAndCompareChain produces non optimal filter conditions
- Docs
- C++ not yet supported