clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 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.
- Add aggregate functions for Geo types
- [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
- Fix is_inner_table logic and allow LowCardinality in external TimeSeries tables
- Add comprehensive PromQL-to-SQL converter functions
- Docs
- C++ not yet supported