clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `buildFilterActionsDAGImpl` names grow 2^depth: PR's query OOM-kills server
- Implement `MaterializedMySQL`
- `DEPENDS ON` cycle of refreshable views stops refreshing after retry exhaustion
- Do not cut the stress test's pre-hung-check wait short on one failed probe
- Fix lazy materialization when `_part_offset` comes from a projection or a table column
- Keep the renamed column's data when a mutation queued before RENAME COLUMN runs after it
- Faster INSERT into ReplacingMergeTree, CollapsingMergeTree and VersionedCollapsingMergeTree when the insert merge only selects rows
- Window functions 5-11% slower: Partition::advance scans row by row
- Default PR CI skips ~7.8k non-sanitizer gtests and test_ytsaurus
- Fix wrong result of `SELECT *, x + 1 AS x` over `remote`
- Docs
- C++ not yet supported