clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- jemalloc: try oversize_threshold:64MiB
- Add test: `StorageSetOrJoinBase::restore` ascending file-order restore is untested by stateless SQL
- Add test: `ATTACH PARTITION ALL FROM` with empty source and self-attach (`src=dst`) untested for `MergeTree`
- Add test: Multi-column scalar subquery in `CREATE TABLE/VIEW AS WITH (SELECT ...)` — only_analyze tuple branch is untested
- Add test: 3-variant Bool + similar-numerics negative case in `validateDataType` untested
- Add test: `ReplicatedMergeTree` w/o columns + non-trivial `PARTITION BY`/`ORDER BY` (`minmax_count_projection` with column refs) is untested
- Add test: `SIZES_OF_COLUMNS_DOESNT_MATCH` for recursive CTE column-count mismatch is untested
- Add test: FINAL-disable guard for virtual row optimization untested with `SELECT FROM ... FINAL`
- Add unit test for not-ready Set detection in filterResultForMatchedRows
- Skip 01192 and 01307 on Azure blob storage
- Docs
- C++ not yet supported