clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Ignore `FileLog` tables left without their files by an interrupted test in the upgrade check log scan
- Introduce Window Aggregate Function Execution Strategy
- Fix exponential parsing time of nested parentheses over a column named `from`
- perf(promql): Switch `in` subqueries to use indexHints when we yield a range of metric IDs.
- Add Delta Lake tables to the data lake corpus and tests of Delta Lake features
- Copy equi-join key filters onto Iceberg and Parquet reads, so they skip files, row groups and pages: Iceberg propagate_predicate_across_equi_join up to 74x faster
- Fix the identifier resolution cache reusing results across hidden lambda arguments
- ClickHouse Iceberg Catalog: Improve connection handling
- 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)
- Docs
- C++ not yet supported