clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Read the CI DB read URL from SSM instead of hardcoding play.clickhouse.com
- Check access to a parameterized view when a query resolves it
- Make `estimateCompressionRatio` estimate `LowCardinality` columns as stored and add a `target_type` parameter for type changes
- Fix rows lost by combined skip indexes when a negated or wrapped `coalesce` comparison is in a disjunction
- Performance comparison: audit of the recent growth of the master_head jobs (long queries, duplicates, amd vs arm)
- Build the default clickhouse-server Docker image FROM scratch
- Rewrite INTERSECT DISTINCT and EXCEPT DISTINCT to JOIN
- Add Delta Lake reader tests with tables from the Trino test suite
- Faster `GROUP BY` of fixed-width keys and one `String`
- Join reorder puts the fact table on the hash build side when a dimension table has no statistics (parts written before 26.8): up to 30x slower than 26.6
- Docs
- C++ not yet supported