clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Arrow IPC reader failures on Apache Arrow gold files
- Apply `SORT + LIMIT` before `ARRAY JOIN`
- Clickhouse change log can be made queryable
- JSONExtract with the RapidJSON parser copies string bodies one byte at a time; a bounded vector scan makes it 7-16% faster on aarch64
- A narrowing integer `CAST` in a minmax skip-index condition re-executes the cast once per granule on a one-row const column — 84.2% of `min_max_index_with_cast`'s wall clock
- Fix native Arrow IPC reader issues found by the Arrow integration gold files
- Split the two un-batched amd_llvm_coverage s3 parallel stateless jobs into 2 batches
- Cleanup directory for table data if DatabaseAtomic::commitCreateTable() throws an exception.
- Support PREWHERE and trivial count for Memory tables
- Reuse loaded part statistics within a query
- Docs
- C++ not yet supported