clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- JOIN USING with alias keys differing by leading underscore joins wrong or throws
- Timed-out or killed query fails the shared HTTP dictionary load for everyone
- Retried `web`-disk ATTACH fails with `LOGICAL_ERROR` after a killed ATTACH
- Add MergeTree setting `vertical_merge_read_in_separate_thread` to overlap reading with writing in Vertical merges
- Add MergeTree setting `merge_build_skip_indexes_in_separate_thread` to build skip indexes in parallel with writing columns
- Should row policies hide pre-filter row counts in `EXPLAIN ESTIMATE`, `read_rows` and the `max_rows_to_read` error?
- Merges spanning a block removed by `DROP PART` or `DETACH PART` are refused until `old_parts_lifetime` passes
- BACKUP ... EXCEPT DATA FROM TABLE db.t ON CLUSTER rejected on every host
- Integration tests (amd_tsan): the server freezes after a fault inside the TSan runtime (`TracePartAlloc`)
- Mixed-sign `modulo` in the sorting key: parts written before 26.9 silently lose rows after upgrade, and merges write a missorted primary index
- Docs
- C++ not yet supported