clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Filter columns in-place in FilterTransform
- Answer `sum`, `avg` and `sumCount` from per-part statistics
- UNIQUE KEY: mutations
- C++ reimplementation of jemalloc in base/allocator
- estimateCompressionRatioIf ignores its condition on the single-place path
- Fix constraint optimization dropping rows at a constraint bound
- Read MATERIALIZED CTEs in parallel
- SIGSEGV on argument-less function via SQL UDF body or EXPLAIN AST
- Merge single-token `NOT hasAll` / `NOT has` predicates on the same column into one `NOT hasAny`
- Fix estimateCompressionRatioIf ignoring its condition without GROUP BY keys and in window functions
- Docs
- C++ not yet supported