clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 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
- Delta lake: fix crash in schema visitor
- Optimize `DISTINCT` transform by disabling `LowCardinality` optimization if preliminary `DistinctSortedStreamTransform` is used
- Forbid columns in PREWHERE conditions that are not specified in the Parquet schema.
- Docs
- C++ not yet supported