clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Create replicated database by default
- Avoid thundering herd effect in the query result cache
- bug fixing system.query_log.read_rows showing 0 rows read for Iceberg
- INSERT queries are 3x slower after upgrading from 25.12 to 26.2
- Allow skipping last N shards when writing to Distributed table
- Convert to FixedHashTable for hash join with small int key range
- Add arrayCombinations, arrayPermutations, arrayPartialPermutations functions
- CI: fix 02151_http_s_structure_set_eof for Mac
- Do not invalidate dictionary if there is only one of them
- Runtime filter granule pruning for JOINs via primary key index
- Docs
- C++ not yet supported