clickhouse
https://github.com/clickhouse/clickhouse
C++
ClickHouse is a free analytics DBMS for big data
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- Issues
- Column TTL not deleting
- Window function parallel evaluation can be a problem sometimes
- 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
- Backport #96995 to 26.1: Fix missing move of query_metadata_cache in BlockIO::operator=
- Forbid columns in PREWHERE conditions that are not specified in the Parquet schema.
- Add aggregate functions for Geo types
- Add aliases to the instruction
- [WIP] Add T64B compression codec
- Docs
- C++ not yet supported