clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `mysqlAmericanDate` uses unconditional `+2000` for year instead of proper 2-digit year conversion
- `join_any_take_last_row` not propagated to `ConcurrentHashJoin` and AUTO fallback `HashJoin`
- Missing `decompress` call in `tryGetSubcolumnFromBlock` causes crash with compressed Memory tables
- `evaluateScalarSubqueryIfNeeded` called too late, missing tuple-rewrite edge case
- `matchIsNullOfTwoArgs` incorrectly treats `notEquals` as semantically neutral with IS NULL
- `StorageJoin` cast skipping in `buildJoinClausesAndActions` fails when `StorageJoin` has smaller type than left table
- `Nullable(DateTime64)` precision check skipped due to `getDataType()` returning `TypeIndex::Nullable`
- FunctionsStress.stress
- Transform JOIN hash table payload to row major
- When a Refreshable MaterializedView fails to delete tmp tables, it keeps creating more tmp tables until the server runs out of disk
- Docs
- C++ not yet supported