clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Segmentation fault (STID: 1717-4a03)
- Add `SYSTEM CLOSE CONNECTIONS` and `SYSTEM CLOSE CONNECTIONS AND STOP LISTEN`
- Push join key filters into MergeTree index during recursive CTE evaluation
- PR: use serialized query plan - part 2
- Column TTL not deleting
- Window function parallel evaluation can be a problem sometimes
- Allow using external tables with any queries in the interactive mode
- system.query_log.read_rows = 0 for Iceberg read even when parquet filter pushdown is disabled (expected full scan)
- Extend lazy materialization to support LIMIT BY and DISTINCT ON queries
- Backport #96754 to 26.1: Better validate explicit iceberg metadata path
- Docs
- C++ not yet supported