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)
- Delta lake: fix crash in schema visitor
- [WIP] Add T64B compression codec
- Patch parts (lightweight updates) not merged with base parts during background merges
- Impossible to access some columns from a subquery reading data from parquet files with inconsistent schema
- Fix bugfix validation failing due to git ownership check in Docker
- Docs
- C++ not yet supported